Hi, I'm new

I have read the following post on changing admin email addresses:
https://help.forumotion.com/frequently-asked-questions-f5/change-your-e-mail-address-t3340.htm#18908

But I wish to know how this scenario will work:

I have set up a forum for a friend of mine who is a bit of a technophobe. She wants to be the main administrator of the forum however, as she is an expert on the forum's subject, and will be doing most of the posting and managing security on the forum.

But because it was me that set up the forum, it's my email address that is registered with you.

Do I need to change my email to hers? (I still want to be an admin though)

Or do I just add her as another administrator?

If so, how do I do that please?

Thanks