How do i make shift a button that can be pressed on the controller?

Do you expect me to watch the entire 20 minute video to find the segment you are referring to? This is your problem, not mine. Link to specific segment.

Also, I will go back to my point. You are not solving a real problem. Saying “left trigger + face button top = F10” does not help, this is not a real problem. What does F10 do? Does it execute a function? Then call that function using the technique that was demonstrated here earlier. You already have all the answers you seek. Just follow the advice you’ve been given.