How do I setup the

First clear it pushing the 2 outer buttons for about 20 seconds till the lite blinks.
Then here is the weird part take the old remote that you use for your garage door opener and hold it next to the home link in the car.
Push the button on your old remote then the button on the home link. the home link will flash slow then quickly (about 10 sec).
Now go push the learn button on the main door unit then back to the car and push the home link again for 2 seconds.

Before you begin, please verify the number of LED lights you have. If you have 3 LED lights, one above each button, your unit is not HomeLink. Please contact your vehicle dealer for training assistance. If you have 1 LED light above the center button, your unit is HomeLink and you may proceed to the instructions below.

1. For first time training, press and hold the two outer HomeLink buttons, releasing only when the HomeLink indicator light begins to flash after 20 seconds. (Do not perform this step when training the additional HomeLink buttons.)
2.
Position the hand-held transmitter 1-3 inches away from the HomeLink surface (located on your overhead), keeping the HomeLink indicator light in view.
3.
Using both hands, simultaneously press and hold both the desired HomeLink button and hand held transmitter button. DO NOT release until the HomeLink indicator light flashes slowly and then rapidly. When the indicator light flashes rapidly, both buttons may be released. (The rapid flashing indicates successful training.)
4.
Press and hold the trained HomeLink button and observe the indicator light.
If the indicator light is solid/continuous, training is complete and your device should activate when the HomeLink button is pressed and released.
If the indicator light blinks rapidly for 2 seconds and then turns a solid/continuous light, proceed with the following training instructions for a rolling code device. A second person may make the following steps quicker and easier. Please use a ladder or other device. Do not stand on your vehicle to perform the next steps.
5. At the garage door opener receiver (motorhead unit) in the garage, locate the “learn” or “smart” button (usually near where the hanging antenna wire is attached to the unit). If there is difficulty locating the training button, reference the garage door opener’s manual or contact us.
6. Press and release the “learn” or “smart” button (the name and color of the button may vary by manufacturer). NOTE: Once the button is pressed, there are 30 seconds in which to initiate the next step.
7. Return to the vehicle and firmly press and hold the trained HomeLink button for two seconds and release. Repeat the “press/hold/release” sequence up to 3 times to complete the training process.