Web Block
Drag a Web Block from the right column into the feed layout.

Fill out the requested fields.
You can either display hosted web content with a URL or copy/paste HTML.
"Enable View Link" allows you to link to a native view (e.g. Donation view) instead of a webpage.

You have the option to specify an expiration date and time to automatically remove your block.
Turn on the "Active" switch.
Click the "Save Block" button.
Preview your Web Block then hit the main "Save" button to make your block live.
