Instructions
Press the "Home" button on the front of your Wii controller. At the bottom of your TV screen, you will see "Wii Remote Settings." Select it using the "A" button on the controller.
Choose "Reconnect." A message will appear indicating that you can now sync multiple Wii controllers.
Press the "1" and "2" buttons at the same time on the Wii controller you want to sync. At the bottom of the controller, the "Player" light will blink until it is synced. If you are adding multiple controllers, sync each controller separately and in the order you prefer.