If the remote and the keypad are compatible to the opener you can do this.

Find the smart/learn button on the back of the motor unit near where all those white wires go. You may have to remove a light lens.

First the remote.

Press and hold the button on the remote while you press and immediately release the smart/learn button.

Now the keypad.

Press and immediately release the smart/learn button and then walk over to the keypad and key in any 4 digit number and press enter.

Should do it for you.