Yup, basically admins are those who would be in charge of taking care of the forum. They are the ones who modifies the forum, change status. So, their job is important.
You can't just appoint just any Tom, Dick or Harry to be an admin unless you can really trust that person.
Well, a rule for becoming a mod so far I know is that do not ask to be one, they will ask you.
I get that all the time.