Instructions
Turn the Wii toward you so you are looking into the DVD slot. If you are operating your console from the flat position, make sure the "Power" and "Reset" buttons are facing upward.
Open the rear door on the top edge of the console, or the far left edge if the console is in the flat position. This door conceals the GameCube memory card slots.
Insert the USB Gecko Adapter into the slot closest to the hinge of the door. This is Memory Card Slot A, and is the port the adapter uses to interface with the Wii's memory.