Watch as the current code cycles. The code will turn orange when it matches, at THAT time, click it. Your BOff will pop up and says the doors are opening. DO NOT just open the window and click click, you must wait for it to match up.
When you have everything working right you have the full code moving, the partial code(s) which will light up at the correct times, and the cancel button. Click only on the partial codes and only when they flash yellow.