You are allowed to forfeit the bonus, but you have to keep in mind that the winnings you generated from the bonus will be removed from your account. To forfeit the bonus, simply click the silhouette icon found at the top part of the page. Next, click the rewards, go to the active bonuses, click the bonus description, click the drop-down arrow, and choose a forfeit bonus. Once you click on the forfeit bonus, your bonus will be removed from your account.