lol i think you get the name "master" at 100 posts. at this time you cannot change master to something nifty. at 200 posts, however, you can. (look at mine) Once you are at 200+ posts, you can change it in your options.
Heh, I am a huge noob, and hey, I'm a 'master'...hmmmmmmm...well its only referring to versions of A:M i think