What are some good ways to earn Rep?
By kissing my ass.
can you change mine back to 0?
No. Rep is just that, your reputation, if you want it to go up become funny, make insightful comments or do crap in the RM section. Your rep is down for two reasons, 1) your a newb, people will have less tolerance for you and 2) you said a few words that annoyed someone or they simply didn't like something in your av/sig. Reputation is a
very petty game in most cases.
Get over it, it's nothing you should care about.
(Oh complaining about it
will get your rep down further).