Hey Chris. To add people to your Wii there is a few simple steps:
1. click on the envelope in the bottom right cornner
2. once in click the address book in the bottom left corner(2nd icon).
3. a book will appear and then click Register button then click add Wii contac.
4. find the persons Wii Number and Wii User name then type that in.
5. after that you will see that persons details in the address book
(please note that the person that u add has to add you too)