How do you program F-2100 remote?

To program the F-2100 remote, first, insert the appropriate batteries and ensure the remote is powered on. Next, press and hold the "SET" button until the red LED lights up, then release the "SET" button. Enter the desired code for your device using the number keys; the red LED will blink and turn off if the code is accepted. Finally, test the remote to confirm that it operates the device correctly.