Click on "Profile" in the top right corner and select " Bonuses" or go straightforward to the "Bonus" page. Here you'll find all your offers. Your not activated offers are located under "Queued Bonuses" section. Choose your offer and press "Activate" button on pop-up offer window.
If you want to delete the offer, click on the active offer that you would like to remove. Scroll down to the bottom of the bonus window to find the option to delete the offer (Remove Bonus).