The goal is to make sure all the lasers point at the front and center of the stage so the lasers in the top view should look like _V_ and the lasers in the side view should all point towards the center. Each button either toggles the position of certain lasers or sets the position to a fixed location. Using the All/T/F/B button can help you understand which lasers are affected by which buttons.
Hope this helps! I can give you hints about the exact button order if it gets too frustrating.