Any forumotion experience? Yes, quite a lot actually.
Have you been an admin before? Yes, on many forums created by people I know.
Do you know anything about being an admin? Yes, of course, like I said, I have been one before. It's very important not to mess with account passwords too, because I don't think people will be happy if you change their password! Even as an admin, you must always get permission from the actual site owner before doing something drastic, like changing something in the forum, like, the whole design. Once you get permission, you are safe to do what you have been told, nothing more, nothing less.