The casino has an Affiliate program, just add a link like this in your sig, and post on the forums and stuff

http://wincoin.pw/casino/?id=1
For every client you refer, you will earn 0.04 WIN, for every 100 WIN bet for the life of that client. (even if they win)

you can find the correct linking under the affiliates tab

You will be promoting WIN, and the casino at the same time.