If the platform of your choice has bonus codes, they usually are sent to you via your email. You need to copy it and write it down to claim the bonus when you make your deposit. In most cases, if you don’t do that, the bonus is not automatically accumulated in your account. So make sure to follow your email and the steps required from you. If you have difficulty, you can always contact the support for help and clarifications. Remember, even if you are referring to Microgaming casinos no deposit bonuses, they could have a code as well.