To be able to withdraw/cash out any bonus winnings, you need to meet the specific wagering requirement. Wagering requirements specify the sum you must wager before you can withdraw any bonus winnings.
If you received a R$50 bonus with a 35x wagering requirement, meaning R$50 x 35 you must wager R$1750 before withdrawing any bonus winnings.
Please also note that different games may contribute differently to meeting the wagering requirements.
Every bonus has its own rules and regulations, so when claiming, please read all terms and conditions carefully.