For your convinience, there was already a thread made; read it by clicking on the following link:
http://www.killermovies.com/forums/showthread.php?s=&threadid=21297&highlight=moderator
in short... the official version is that you don't ask, be nice and be active
Oh. Thanks for the link. I kinda got confused there because in this other forum which I've been in for 3 years now, they don't pick you as a moderator. You tell the super-mod, then you just have to make a certain amount of post and must compromise to be active in the forum you're applying to moderate. The super-mod then makes a thread on you applying as a moderator and waits for at most 48 hours for members to vote for you. If at least 14 people said they trusted you to be moderate that certain forum, then you're in (and this only happens if the members know you well. they don't vote in a poll. they vote by reasons in which why or why you shouldn't be a moderator).
Well, thanks anyways for the link! =) Read it, understood it, got it. =)