To find the activation code, go onto the Netflix Channel from your Wii (if you do not have the Netflix Channel, download it from the Wii Shop Channel). On the first page of the Netflix Channel, you should see something that says:

To activate this Wii to stream instantly from Netflix:

 

1. On your computer, go to: www.netflix.com/activate

 

2. Enter this code: <activation code>

The activation code given on the Netflix Channel must be entered at that Netflix link. After you login to Netflix through that link, you will see a space to type in your code, and next to that space will be a button that says "Activate". All you have to do is enter in the code from the Netflix Channel, click "Activate", and your Wii will automatically be activated to stream Netflix.