Instructions
Insert a SD card into the SD slot on the front of the Nintendo Wii.
Open the "Wii Shop Channel" from the Nintendo Wii's main menu. This will display a list of the games and Wii channels available to download.
Press the "A" button while highlighting the name of a game or Wii channel that you want to download. A screen will pop up with more information about the particular game or channel.
Press "Download." This option will be named "Redownload" if you have previously downloaded this particular piece of software.
Select "Yes" to confirm that you want to download the software.
Choose "SD Card" to download the game or Wii channel directly to the SD card.