(2) Press and release “learn” button on garage door opener mechanism (red button, LED turns on) (3) Lightbulb flashes (or audible clicks if no bulb) twice. Code is now learned. This worked for 2 non-keypad garage door openers. But this keypad’s instructions seem to be incompatible.
https://www.amazon.com/Overhead-Door-Wireless-Garage-Weather-Resistant/dp/B009KBKZZU