[JDMautogames.com]

Homelink Universal Transmitter w/ 3 bottom:

1, erase previously memory by holding the two outside buttons for about 20 sec until the red light flashes.
2, hold the end of the garage door opener remote control 2 to 5 inches from the homelink transmitter. Make sure nothing is blocking.
3, select the transmitter button you want.
4, press the button on the remote control and the button on the transmitter at the same time. Hold down both buttoms.
5, The red light in the transmitter should begin flashing. it will flash slowly at first, then rapidly.
6, When the red light flashes rapidly, release both button. The transmitter should have learned the code from the remote contorl.
Now you all set...