You usually get a set amount of money to bet when you deposit and that money can't be redeemable for cash. For example, if you bet the bonusR$5 and lose, that money is gone. If you betR$5 and profit anotherR$5, you'll be upR$5 in real money.
Most sportsbooks make it quite easy.
1
Navigate to your desired game and bet type.
2
Click the "bet cell"
3
The bet will populate in your bet slip.
4
Enter your bet amount.
5
Submit bet.