Each Nintendo-published game or Nintendo system you buy comes with a product registration card. Scratch off the silver security layer on the card to reveal the product's PIN code and use this field to enter the code. Once you’ve finished this process, your Club Nintendo account will be credited with the number of Stars that product is worth. If you don’t have a Club Nintendo account, you’ll be asked to complete the membership form during the product registration process.
Registration and completing the survey for hardware:
Registration and completing the survey for packaged software: