Follow the routine in the user guide:
1. Switch on the drone (press button for 3 seconds).
2. Switch on the transmitter (2 short presses)
3. Move left joystick fully up and fully down.
This should complete the pairing, and you should be able to move the camera around. To start the motors:
4. Simultaneously move left joystick to 5 o'clock and right joystick to 7 o'clock.
If it still fails, consult the manufacturer