How/when do I become expert member on Railbirds?

Yes, I had a question regarding becoming an expert member on here A.K.A. having becoming turqoise color. My current status here at railbirds is 'beginner' and the pink color. Obviously when you first sign up you were a novice. I very quickly turned to a beginner though not long after becoming member here. I wasn't sure if there was something I had to do or possibly something I had to accomplish to become considered an expert on here. I was thinking it could be a few different things such as maybe winning a freeroll, amount of time you have been a member, how active you are, etc., etc. I mean I have been a member for over a year, won two Railbird freerolls, and been very active so don't think it is that. I would appreciate it if somebody could tell me how my status changes to expert. Is there anything I need to do or at what point will this happen?? Thanks for the people who respond with answers and as always GL at the tables...Mikey