Instructions
Press the large button in the center of your first Xbox controller to turn the console on. You will automatically log in with your primary profile.
Press the large button in the center of your second Xbox controller to activate the controller and open the guide menu.
Select the "Create Profile" option from the guide menu. Enter a name for your profile and create an avatar. Once you have done both, select the "Save and Exit" option.
Begin playing your "Army of Two" game. Press the large button in the center of the second controller and select the "Log In" option. Select your second profile and log in to the game with it.