First of all, you need to find out whether the bonus you are about to claim is cashable or not. If it is, you should find out its wagering requirements — this is the number of bets you have to make before you are allowed to cash out the bonus. If it is non-cashable, the rule with wagering requirements works in a different way: after making the required number of bets, you will be able to cash out all the money on your balance APART from the bonus.