How to redeem the key on Nintendo Switch:
1. Select “Nintendo eShop” on the HOME Menu to launch the Nintendo eShop.
2. Select the account you want to use.
3. Select “Enter Code” on the left side of the screen.
4. Enter the 16-character download code. ...
5. Select “Send” to confirm.
Please be advised some products may have separate instruction available for them in System Requirements Tab.