Since this is only a 5 minute procedure, take it apart and start over. Unplug your garage door opener. Connect the positive wire on the receiver to the positive terminal on your garage button. Connect the negative wire on the receiver to the negative terminal on the garage button. Make sure the antenna from the receiver is hanging down. Plug your garage door opener back in. Get someone to hold the button in on the receiver while you toggle the hi/lo beam switch to program. Try it to see if it works. If I recall correctly, that is all there is to it.
I don't suppose there is any chance you have changed the wiring on your headlamps at all. Perhaps you changed it to keep the passing lamps on with the high beams or something like that. Changes to your headlamp wiring could affect this, but otherwise this should be a quick easy setup.