May be one more step...
after you have programmed the Homelink button, you then may have to "train" your garage door opener as most newer models don't just take a signal from any old opener... just park in the garage under the opener (I have tried to train mine from outside the garage, but it never worked) and follow the instructions... have to press the training button on the garage door opener... usually located in the back near the antenna, and within 30 seconds, press the Homelink button you programmed in the SSR for 2-3 seconds and then press a second time. After that, you should press it again and the door should open or close. Worked for mine the first time I had the SSR in the garage for the training part. Hope this helps. Good luck!