Please follow these steps below to find your MAC Address:
*NOTE* The Wii requires a USB Wii Ethernet Adapter in order to go online.
1. When at the Wii Menu screen, click the Wii icon in the lower left corner.
2. Select Wii Settings.
3. Click the arrow on the right side of the screen to advance to the next page of settings.
4. Select Internet.
5. Select Console Information.
6. MAC Address will now appear.