The best thing to do is to leave this website and withdraw all your bitcoins or satoshis and migrate to another reputable and fair site now before it's too late.
Can anyone recommend a website that has fair games and good support to replace this one?
While looking for books, reviews, threads and gambling a bit, I understood some (not all)
basics of gambling, but didn't write a
how-to, because people credible to me also didn't but I don't pretend to know them all. So, I wish you the best in your journey starting to search if someone has ever won a prize of thousands USD offered for proving a system that could beat any gambling site of their choice.
Pay attention - this is about method and there are others that can be better for you.