Are you talking about being just a moderator or an admin?
Well here's the answer for both:
To be a moderator (or this is what I heard) you must send an e-mail to one of the admins (I don't know which ones) explaining why you should be a mod. (note: You need to have maturity, grammar, and correct spelling if you even want to have a shot at this.)
To be an admin I'm probably wrong, but from how Ferret said something about starting his cubicle or something I'm guessing you have to grow up into an adult and drive around the country to look for AGco. (Again I may be wrong.)