Hi Donna,
Try this:
Forget about the forum created.
Instead start a new forum with the same username and same forum name, but using the correct email address.
You should then receive an email with a link to click which will register that address. As you click on it, it should open the forum with you logged in as the administrator.
You will then have all the appropriate options available so you can set embedding and make whatever other customisations you need.
(At least, I've just tried that and it seems to work! In fact, I think it even presented me with the original forum as I can find no trace of a different URL for the forum in my browser's history.)
Volunteer Helper - but recommending that users move off the platform!
Once the admin for GregHelp now deleted.