Agree with UK about the RP shoutbox, but here's the thing; you post your bio, you wait for the rp creator to say "accepted!

" you wait for the first post then you start. If no-one says "accepted" or anything, then you could ask "Am I part of this RP?" it's possible that they missed your post, or they may have ignored it if you didn't comply with the rules. Don't just join uninvited. Obviously with Private RP's it's a no-brainer; don't join unless you were specifically invited!