Should you need it, here is where you can find more information about redeeming codes. Please note that you should receive the unlock instructions by email sometime before the release.
To find out how to redeem a code on Nintendo Switch, please have a look at this official Nintendo article.
Once your code is redeemed, you will be able to find the items in-game. If you are in doubt where to look for them, visit this article.
Should you have trouble redeeming your code, feel free to contact us!