Instructions
Remove your SD card from your Nintendo Wii console and insert the SD card into your computer&'s card reader.
Locate your Wii game that is on your computer and right-click it. Click "Copy" and go to your SD card on your computer.
Right-click the "WAD" folder on the SD card and click "Paste" to copy the game to Wii SD card. Eject the SD card when the transfer completes.
Reinsert your SD card into your Wii and turn the Wii on. Your game will now be installed on the Wii menu.