Instructions
Open the SD card bay on the front of the Wii console and the battery bay on the bottom of the Wii Balance Board.
Press the red "Sync" button inside the battery bay on the Balance Board.
Press the red "Sync" button in the SD card slot on the Wii console. The LED indicator on the Balance Board and Wii console will blink and then go solid to indicate that the two devices have been synced.