Things You'll Need
Instructions
Get a classic NES controller from an online auction website or from a specialty game store that carries retro video game products. They're usually inexpensive by themselves, although they can get pricey if part of a complete, original NES set.
Plug the NES controller into the matching port on the adapter. The NES side of the adapter looks like seven ports lined up straight, with four on one side and three on the other.
Plug the GameCube port adapter into the Wii at the GameCube controller port.
Use your NES controller to navigate the Wii menus as you normally would using a regular Wiimote. It may be necessary to start your Wii using the Wiimote, but you can then switch to the classic NES controller once you're up and running.
Choose a game from the virtual console that you wish to play. Try to avoid using the classic NES controller with SNES games, however, as the classic controller lacks the two top bumpers.