Instructions
Insert your SD card into the SD card slot on the Nintendo Wii. This is located behind a panel beside the disk drive. Then turn on your Wii.
Click the "Wii options" button on the bottom left of the Wii's main menu, then select "Data Management," then "Save Data," and finally, "Wii."
Select the "SD Card" tab at the top of the screen. Choose the game you'd like to transfer to your Wii, and press "Copy."
Click "Yes," and the file will copy over to the Wii's memory.