go to the opener manufacturer website
you dont need the remote. however it may be useful to have instructions from your opener manufacturer. on th back of the opener there should be a learn button after this is pressed
(a flashing led on back if you have one will start) it should go into a learning mode and pressing the chosen button in the car a number of times will sync the car and opener (again indicaded by a led singal, which is solid on on my unit) i beleive this is covered in the manual. also on my unit there is an additional button that erases all remotes. i have to climb on a ladder to reach the back of the opener so two people could be easier.