@Fuji 3 first steps that you have already done.
1) Go to csgodouble.com
2) Sign in through Steam.
3) Go to "Free Coins" and put the code.
At this point you will have 500 points.
So you have the option to withdraw a 500 points worth skin or to gamble these points.
If you want to withdraw a skin => Go to "Withdraw"
If you want to Gamble the 500 points => Go to "Home"
Once you are in Home, you see firstly a roulette. Then you can perfectly see this "Balance : ____". The Balance is where you can see the amount of your points. Then you can see a case called "Bet amount...", go there and put 500.
Once you have put the 500 points in the "Bet amount" case, you can choose between
1 to 7 ,
0 and
8 to 14.
1 to 7 => red numbers from the roulette = 1, 2, 3, 4, 5, 6, 7.
0 => only green number from the roulette = 0
8 to 14 => black numbers from the roulette = 8, 9, 10, 11, 12, 13, 14.
Now you have the choice. Keep in mind that gambling on red or black numbers is safer but will get you less points and that if you gamble on 0, you are gonna take a big risk but you will have the opportunity to earn more points if you win.
@Bes^