You can find a bonus or free spins in your account by opening the account settings. Directly on the start page, you will find a list in the middle of all open bonuses and free spins which you can either still accept or have already accepted.
You can also see the progress of the free spins played or the playthrough achieved so far.
Important: A cancelled bonus cannot be restored. If you cancel an active bonus, you will not only lose your previous playthrough progress and the bonus balance, but also the right to this bonus.