---
schema_version: "1"
id: b20a5f6774a3a2b38dfb698f586af1bc5b844c7c4f9c5c886a6ad84c16b08ed7
title: Register Endpoint for Custom Content Block Component
collection: developer
version: current
locale: en-us
portal_url: https://docs.salesforce.com/developer/current/en-us/marketing-cloud/guides/mc-app-development/create-content-block.md
canonical_url: https://developer.salesforce.com/docs/marketing/marketing-cloud/guide/create-content-block.html
source_site: developer.salesforce.com
content_type: documentation
content_hash: 16a142acb55188b0d8feeb5939c1b67283c61b57d2a2eab437c33694ffeadc88
products:
  - Marketing Cloud Engagement APIs and Programmatic Languages
  - Marketing Cloud
---
# Register Endpoint for Custom Content Block Component

Once you know the hosted endpoint for your custom content block UI, you must register that endpoint in an installed package.

**note:** To add content blocks to an existing app, add them as components in the same package.

1. [Create an installed package](https://developer.salesforce.com/docs/marketing/marketing-cloud/guide/install-packages.md) or navigate to an existing package.
2. Under Components, click **Add Component**.
3. Select **Custom Content Block**.
4. Type a **Name** and **Description** for the content block. This name doesn't display in Content Builder.
5. Enter the **Endpoint URL**, which is the base URL for your block widget. Content Builder loads all assets relative to this endpoint.
6. To complete registration, save the component.

## Related Items

- [List Your App in AppExchange](https://developer.salesforce.com/docs/marketing/marketing-cloud/guide/list-app-appexchange.md)