when i try to run a love function it just prints this before causing the script not to work

"mods/FridayFunkin/data/cool-tt/main.lua:11: attempt to index global 'love' (a nil value)"

very new to Love2d (just installed it) and im wondering how exactly i would go around editing an already existing window if i run a love2d program after its already been opened outside of love2d ik this is gonna sound dumb but i had a pretty cool sounding idea for an fnf modchart and am wondering ho...