There are two choices:
1) Apply to become one -
2) Get promoted-
If someone notices you giving really good and helpful advice you could even get promoted to become an advisor. When you answer questions be detailed and helpful in your answer. Always be nice even when its hard to, and always be sure to follow the rules.
Good luck. :)
u need to contact thedude or editor I think and send them some of the advice you have given others and than they decide if you become one =]
Give good advice, waite for them to see your good advice and make you an adviser or just apply for one...