Total coding noob here... I'm trying wrap my head around how to use lua code, and I can't wrap my head around how to get the freelook script to work. I get that I actually have to adjust some things in the code myself, but I'm unclear about what values need changing, and no matter what I do the code stops running because register3devent is a nil value..? Even when I think I'm defining it correctly?

Freecam is a feature I'd really like, but I'm too tech-illiterate to wrap my head around how the lua script works, even with the instructions given on the github and in the script itself.. help?