I don't have a Multi-Function door control with a light button, so I had to change the instructions slightly.
My garage door opener has a learn button on the overhead unit. Here's what I did and it worked!
1. enter your chosen 4 digit code on they keypad.
2. Press and hold the "enter" button.
3. Press and hold the learn button on the overhead unit.
4. When overhead light blinks, release both buttons.
Thank you soooooooo much to Paul Messer for the original instructions. I purchased a new home and the previous owner didn't leave the instructions. I've been at my new house for about a year and I can finally use my own keypad!