add user to set up "rooms" for group participants

I'd like to add a user so I can set up "accountability pods" for my course members to hop into... that I won't be attending.  I understand I need to set up a user that's attached to a different email address. I did that, but it's not showing - it says I have to wait for that user to register. But it's ME. And I have not received instruction on how to register my other email address. HELP?