Genie and Liftmaster are two of the most well-known names in the garage door and garage-door opener industry. Both Genie and Liftmaster use "Learn" buttons located on the overhead motor units to program remotes to their garage door opening system. If you have a spare Genie remote that operates on the same frequency as your Liftmaster garage-door opener, you can program it to operate your automatic garage door in five minutes or less.
Locate the "Learn" button on the overhead motor unit of your Liftmaster garage-door opener.
Erase all previous codes from the overhead motor unit's memory. Note that this will require you to reprogram any previously programmed garage-door-opener remotes. Press and hold the "Learn" button for six seconds, or until the indicator light above the button goes out.
Press and release the "Learn" button on the Liftmaster opener's overhead motor unit. The indicator light will turn on and glow for 30 seconds to signify that the unit is ready to be programmed.
Press and hold the large button on the Genie remote to program it to your Liftmaster opener. Let go of the button when the main lights on the overhead motor unit flash, indicating that the remote programming has been successfully completed.