The magic formula of the Clicks Go to URL value that will show almost any HotDoodle content is
Where all that differs is the CID.
CID means "container id" and is the numericial identifier of the attachment of the object to its container. The important thing to remember is that if you edit or configure almost any block you will see a cid. For example, as we edit this description, our browser shows
So to show this block as a overlay we would use