Power up the transmitter and receiver and connect the receiver to your monitor.
Use the menu joystick on the receiver to navigate to pairing. You can reach the menu by flicking the joystick to the right. Once you click pairing, it will ask you to activate registration on the Tx.
With a paperclip, press (do not hold) the reset button in the pinhole (marked with swirling arrows) on the transmitter. The monitor should then ask to confirm the connection by pressing OK. Press the menu button or flick it right to proceed.