Try page 5/6 of manual. You use button press sequence of Transmitter ID button with indications from LED to change Transmitter ID
To set a new transmitter ID: 1. Push and hold the transmitter ID button until the LED begins flashing quickly. This indicates it is in the setup mode. 2. Release the button, and the LED will go dark. 3. Push the button the number of times equal to your desired new transmitter ID. That is, if you want to change the ID to 3, push the button three times; for a desired ID of 4, push the button four times. After four seconds have elapsed with no further presses, the LED will blink the same number of times as the new transmitter ID. (After blinking the transmitter ID number, the light will begin to flash each time a packet is transmitted, about every 2.5 seconds.)
