MTG Salvation

I'm already familiarized with most rulings and I understand how to give rulings and most people at my local store view me as an unofficial judge when we don't have one but how do I become an official sanctioned judge what steps and requirements must I meet?

This may help:

http://www.mtgsalvation.com/forums/magic-fundamentals/magic-rulings/251939-how-to-become-a-magic-judge

thank you good sir mod