I have a 2017 Explorer Platinum. I'd like to program the homelink garage door opener to open my LiftMaster garage door opener but I don't have a remote control for it. All of the instructions I have found assume you have the remote. I have attempted to program it by pressing the learn button on the garage door opener and then pressing the button on the homelink 3 times but I can't get it to work. I erased the homelink settings by pressing and holding buttons 1 and 3 for 10 seconds before trying to program it. Any help would be appreciated. Thanks!