[AVIMAX]

Here's how you do it in Canada (we have rolling code door openers), maybe it's the same where you are.

1. Erase all previous codes by holding button 1 and 3 until the light flashes.
2. Hold the button you want to program. At the same time, hold the remote button for 2 seconds, then release and repeat a few times (the remote, not the mirror) while constantly holding the mirror button, the light should change from slow flashing to rapid flashing in about 5-10 seconds. The mirror and the remote are now duplicates, but the mirror is not linked to the opener yet.
3. On the garage door opener unit, there is a program or teach button (usually an orange square button), press it, a light near the button will come on.
4. Press and release the mirror button you just programmed repeatedly until the garage door responds.

Good luck, the old style non-rolling code openers were much easier.