Joystick and teleop
Real Robot
In the case of the real robot the launch file include the teleop node, you have to launch the robot cob_bringup and init the components (you can do it with the joystick, with the dashboard all calling the service component_controller/init).
The configuration of the buttons are explained in cob_teleop.
Simulation
After bring up the robot simulation cob_bringup_sim you have to init the teleop node for the joystick:
roslaunch cob_bringup teleop.launch
The configuration of the buttons are explained in cob_teleop.
Also you can move the base using the keyboard with the launch file:
roslaunch cob_teleop teleop_keyboard.launch