diff --git a/apps/admin-x-settings/src/admin-x-ds/global/form/HtmlEditor.tsx b/apps/admin-x-settings/src/admin-x-ds/global/form/HtmlEditor.tsx
new file mode 100644
index 0000000000..844941227e
--- /dev/null
+++ b/apps/admin-x-settings/src/admin-x-ds/global/form/HtmlEditor.tsx
@@ -0,0 +1,160 @@
+import React, {ReactNode, Suspense, useCallback, useMemo} from 'react';
+
+export interface HtmlEditorProps {
+    value?: string
+    onChange?: (html: string) => void
+    onBlur?: () => void
+    placeholder?: string
+    nodes?: 'DEFAULT_NODES' | 'BASIC_NODES' | 'MINIMAL_NODES';
+}
+
+declare global {
+    interface Window {
+        '@tryghost/koenig-lexical': any;
+    }
+}
+
+const fetchKoenig = function ({editorUrl, editorVersion}: { editorUrl: string; editorVersion: string; }) {
+    let status = 'pending';
+    let response: any;
+
+    const fetchPackage = async () => {
+        if (window['@tryghost/koenig-lexical']) {
+            return window['@tryghost/koenig-lexical'];
+        }
+
+        await import(editorUrl.replace('{version}', editorVersion));
+
+        return window['@tryghost/koenig-lexical'];
+    };
+
+    const suspender = fetchPackage().then(
+        (res) => {
+            status = 'success';
+            response = res;
+        },
+        (err) => {
+            status = 'error';
+            response = err;
+        }
+    );
+
+    const read = () => {
+        switch (status) {
+        case 'pending':
+            throw suspender;
+        case 'error':
+            throw response;
+        default:
+            return response;
+        }
+    };
+
+    return {read};
+};
+
+type EditorResource = ReturnType<typeof fetchKoenig>;
+
+class ErrorHandler extends React.Component<{ children: ReactNode }> {
+    state = {
+        hasError: false
+    };
+
+    static getDerivedStateFromError() {
+        return {hasError: true};
+    }
+
+    componentDidCatch(error: any, errorInfo: any) {
+        console.error(error, errorInfo); // eslint-disable-line
+    }
+
+    render() {
+        if (this.state.hasError) {
+            return (
+                <p className="koenig-react-editor-error">Loading has failed. Try refreshing the browser!</p>
+            );
+        }
+
+        return this.props.children;
+    }
+}
+
+const KoenigWrapper: React.FC<HtmlEditorProps & { editor: EditorResource }> = ({
+    editor,
+    value,
+    onChange,
+    onBlur,
+    placeholder,
+    nodes
+}) => {
+    const onError = useCallback((error: any) => {
+        // ensure we're still showing errors in development
+        console.error(error); // eslint-disable-line
+
+        // TODO: Sentry integration?
+        // if (this.config.sentry_dsn) {
+        //     Sentry.captureException(error, {
+        //         tags: {lexical: true},
+        //         contexts: {
+        //             koenig: {
+        //                 version: window['@tryghost/koenig-lexical']?.version
+        //             }
+        //         }
+        //     });
+        // }
+        // don't rethrow, Lexical will attempt to gracefully recover
+    }, []);
+
+    const koenig = useMemo(() => new Proxy({} as { [key: string]: any }, {
+        get: (_target, prop) => {
+            return editor.read()[prop];
+        }
+    }), [editor]);
+
+    return (
+        <koenig.KoenigComposer
+            nodes={koenig[nodes || 'DEFAULT_NODES']}
+            onError={onError}
+        >
+            <koenig.KoenigComposableEditor
+                className='koenig-lexical koenig-lexical-editor-input'
+                darkMode={false}
+                isSnippetsEnabled={false}
+                // TODO: set based on nodes or remove if there's another way to get the minimal editor
+                markdownTransformers={[]}
+                placeholderClassName='koenig-lexical-editor-input-placeholder'
+                placeholderText={placeholder}
+                singleParagraph={true}
+                onBlur={onBlur}
+            >
+                <koenig.HtmlOutputPlugin html={value} setHtml={onChange} />
+            </koenig.KoenigComposableEditor>
+        </koenig.KoenigComposer>
+    );
+};
+
+const HtmlEditor: React.FC<HtmlEditorProps & {
+    config: { editor: { url: string; version: string; } };
+    className?: string;
+}> = ({
+    config,
+    className,
+    ...props
+}) => {
+    const editorResource = useMemo(() => fetchKoenig({
+        editorUrl: config.editor.url,
+        editorVersion: config.editor.version
+    }), [config.editor.url, config.editor.version]);
+
+    return <div className={className || 'h-[200px] w-full'}>
+        <div className="koenig-react-editor w-full [&_*]:!font-inherit [&_*]:!text-inherit">
+            <ErrorHandler>
+                <Suspense fallback={<p className="koenig-react-editor-loading">Loading editor...</p>}>
+                    <KoenigWrapper {...props} editor={editorResource} />
+                </Suspense>
+            </ErrorHandler>
+        </div>
+    </div>;
+};
+
+export default HtmlEditor;
diff --git a/apps/admin-x-settings/src/admin-x-ds/global/form/HtmlField.stories.tsx b/apps/admin-x-settings/src/admin-x-ds/global/form/HtmlField.stories.tsx
new file mode 100644
index 0000000000..98c052252e
--- /dev/null
+++ b/apps/admin-x-settings/src/admin-x-ds/global/form/HtmlField.stories.tsx
@@ -0,0 +1,33 @@
+import type {Meta, StoryObj} from '@storybook/react';
+
+import HtmlField from './HtmlField';
+
+const meta = {
+    title: 'Global / Form / Htmlfield',
+    component: HtmlField,
+    tags: ['autodocs'],
+    args: {
+        config: {
+            editor: {
+                url: 'https://cdn.jsdelivr.net/ghost/koenig-lexical@~{version}/dist/koenig-lexical.umd.js',
+                version: '0.3'
+            }
+        }
+    }
+} satisfies Meta<typeof HtmlField>;
+
+export default meta;
+type Story = StoryObj<typeof HtmlField>;
+
+export const Default: Story = {
+    args: {
+        placeholder: 'Enter something'
+    }
+};
+
+export const WithHeading: Story = {
+    args: {
+        title: 'Title',
+        placeholder: 'Enter something'
+    }
+};
diff --git a/apps/admin-x-settings/src/admin-x-ds/global/form/HtmlField.tsx b/apps/admin-x-settings/src/admin-x-ds/global/form/HtmlField.tsx
new file mode 100644
index 0000000000..ae507d676a
--- /dev/null
+++ b/apps/admin-x-settings/src/admin-x-ds/global/form/HtmlField.tsx
@@ -0,0 +1,60 @@
+import Heading from '../Heading';
+import Hint from '../Hint';
+import HtmlEditor, {HtmlEditorProps} from './HtmlEditor';
+import React from 'react';
+import clsx from 'clsx';
+
+export type HtmlFieldProps = HtmlEditorProps & {
+    /**
+     * Should be passed the Ghost instance config to get the editor JS URL
+     */
+    config: { editor: { url: string; version: string; } };
+    title?: string;
+    hideTitle?: boolean;
+    error?: boolean;
+    hint?: React.ReactNode;
+    clearBg?: boolean;
+    className?: string;
+    containerClassName?: string;
+    hintClassName?: string;
+    unstyled?: boolean;
+}
+
+/**
+ * Renders a mini Koenig editor using KoenigComposableEditor.
+ * Intended for use in settings forms where we don't need the full editor.
+ */
+const HtmlField: React.FC<HtmlFieldProps> = ({
+    title,
+    hideTitle,
+    error,
+    placeholder,
+    hint,
+    value,
+    clearBg = true,
+    className = '',
+    containerClassName = '',
+    hintClassName = '',
+    unstyled = false,
+    ...props
+}) => {
+    const textFieldClasses = unstyled ? '' : clsx(
+        'h-10 border-b py-2',
+        clearBg ? 'bg-transparent' : 'bg-grey-75 px-[10px]',
+        error ? `border-red` : `border-grey-500 hover:border-grey-700 focus:border-black`,
+        (title && !hideTitle && !clearBg) && `mt-2`,
+        className
+    );
+
+    return (
+        <div className={`flex flex-col ${containerClassName}`}>
+            {title && <Heading className={hideTitle ? 'sr-only' : ''} grey={value ? true : false} useLabelTag={true}>{title}</Heading>}
+            <div className={textFieldClasses}>
+                <HtmlEditor {...props} value={value} />
+            </div>
+            {hint && <Hint className={hintClassName} color={error ? 'red' : ''}>{hint}</Hint>}
+        </div>
+    );
+};
+
+export default HtmlField;
diff --git a/apps/admin-x-settings/src/components/settings/membership/portal/SignupOptions.tsx b/apps/admin-x-settings/src/components/settings/membership/portal/SignupOptions.tsx
index fec5e5b2a3..ce901b6ca1 100644
--- a/apps/admin-x-settings/src/components/settings/membership/portal/SignupOptions.tsx
+++ b/apps/admin-x-settings/src/components/settings/membership/portal/SignupOptions.tsx
@@ -1,6 +1,7 @@
 import CheckboxGroup from '../../../../admin-x-ds/global/form/CheckboxGroup';
 import Form from '../../../../admin-x-ds/global/form/Form';
-import React, {useContext} from 'react';
+import HtmlField from '../../../../admin-x-ds/global/form/HtmlField';
+import React, {useContext, useMemo} from 'react';
 import Toggle from '../../../../admin-x-ds/global/form/Toggle';
 import {CheckboxProps} from '../../../../admin-x-ds/global/form/Checkbox';
 import {Setting, SettingValue, Tier} from '../../../../types/api';
@@ -15,9 +16,17 @@ const SignupOptions: React.FC<{
 }> = ({localSettings, updateSetting, localTiers, updateTier}) => {
     const {config} = useContext(SettingsContext);
 
-    const [membersSignupAccess, portalName, portalSignupCheckboxRequired, portalPlansJson] = getSettingValues(localSettings, ['members_signup_access', 'portal_name', 'portal_signup_checkbox_required', 'portal_plans']);
+    const [membersSignupAccess, portalName, portalSignupTermsHtml, portalSignupCheckboxRequired, portalPlansJson] = getSettingValues(
+        localSettings, ['members_signup_access', 'portal_name', 'portal_signup_terms_html', 'portal_signup_checkbox_required', 'portal_plans']
+    );
     const portalPlans = JSON.parse(portalPlansJson?.toString() || '[]') as string[];
 
+    const signupTermsLength = useMemo(() => {
+        const div = document.createElement('div');
+        div.innerHTML = portalSignupTermsHtml?.toString() || '';
+        return div.innerText.length;
+    }, [portalSignupTermsHtml]);
+
     const togglePlan = (plan: string) => {
         const index = portalPlans.indexOf(plan);
 
@@ -98,7 +107,15 @@ const SignupOptions: React.FC<{
             />
         )}
 
-        <div className='red text-sm'>TODO: Display notice at signup (Koenig)</div>
+        {/* TODO: validate length according to hint */}
+        <HtmlField
+            config={config as { editor: any }}
+            hint={<>Recommended: <strong>115</strong> characters. You've used <strong className="text-green">{signupTermsLength}</strong></>}
+            nodes='MINIMAL_NODES'
+            title='Display notice at signup'
+            value={portalSignupTermsHtml?.toString()}
+            onChange={html => updateSetting('portal_signup_terms_html', html)}
+        />
 
         <Toggle
             checked={Boolean(portalSignupCheckboxRequired)}
diff --git a/apps/admin-x-settings/tailwind.config.cjs b/apps/admin-x-settings/tailwind.config.cjs
index 05ffc9c1c9..30c4c13c3a 100644
--- a/apps/admin-x-settings/tailwind.config.cjs
+++ b/apps/admin-x-settings/tailwind.config.cjs
@@ -81,7 +81,8 @@ module.exports = {
             inter: 'Inter',
             sans: 'Inter, -apple-system, BlinkMacSystemFont, avenir next, avenir, helvetica neue, helvetica, ubuntu, roboto, noto, segoe ui, arial, sans-serif',
             serif: 'Georgia, serif',
-            mono: 'Consolas, Liberation Mono, Menlo, Courier, monospace'
+            mono: 'Consolas, Liberation Mono, Menlo, Courier, monospace',
+            inherit: 'inherit'
         },
         boxShadow: {
             DEFAULT: '0 0 1px rgba(0,0,0,.05), 0 5px 18px rgba(0,0,0,.08)',
@@ -227,7 +228,8 @@ module.exports = {
                 '6xl': ['6rem', '1'],
                 '7xl': ['7.2rem', '1'],
                 '8xl': ['9.6rem', '1'],
-                '9xl': ['12.8rem', '1']
+                '9xl': ['12.8rem', '1'],
+                inherit: 'inherit'
             },
             lineHeight: {
                 base: '1.5em',