you get chosen by helping new players been good it can take years to be offerd and you cant troll or be immaute)swearing/going off you nutt if some 1 trolls)
Be a really good boy/girl on the RSOF, being super helpful, using your knowledge to the full extent, and no doubt you will get f-mod, then if they see that maturity spread ingame, p-mod also
File LOTS of spam reports, post actively and helpfully in every topic (good grammar does help and shows you're professional and not just looking to get up post count) and in general become noticed in the community.
Asking doesn't help at all also, you just have to be noticed. Don't count on it happening soon, people that have been around longer tend to be recognised first.