Things You'll Need
Instructions
Head to Nintendo's Registration website (see Resources below). New users and returning members can register their consoles from within this domain, as well as contact customer service with questions.
Click the "Click here to become a member of My Nintendo and register your newly purchased Wii" link to create a new My Nintendo account if you don't already have one. Click on the "click here to register your Wii now!" link if you are already a member of My Nintendo.
Enter your birth date and click the "Sign Up" button when starting the entire registration/account creation process. If you're already a member, then you can simply type in your username and password in the appropriate field and click the "Log In" button.
Enter your Wii console serial number into the "Wii" field once you have logged in or completed account creation. You can also register other consoles or handhelds on this page, as well as up to four games you currently own.
Click the "Submit" link once you have finished filling in all appropriate serial numbers. Double-check your typing to ensure that you haven't made a mistake (invalid numbers will be returned as such if you submit them, but you'll be able to go back and retype if you make a mistake).