Instructions
Synchronize a second Wii Remote to the Wii console, if you have not yet done so. With the Wii turned on, tap the "Home" button on the first player's remote. Choose "Wii Remote Settings," and then "Reconnect." Hold down the "1" and "2" buttons on the second remote to complete its synchronization.
Pull the Wii Remote's wrist strap cord through the connector hook.
Insert the Classic Controller's cord into the extension connector on the bottom of the Wii Remote. The Classic Controller may now be used in two-player games.