In the menu, go to the camera setting and choose the camera position (1-4) which is free. A free position will have no star indicated next to it – a star means that there is already a camera paired to this position. When choosing a free position, it will start blinking. Then, in the back of the new camera, press and hold the “PAIR” button until the connection is established. That’s all. DO NOT use this menu option to switch between the paired cameras as it is intended for pairing purposes only. Instead use the OK button on your parent unit.