Collision and Performance

Hi its my first time here so hello ,what i am trying to do is make a game when ball hits you you lose life. But now i can only move ball normal around, but i want to do it with gun or with ability so that it moves when you shot it or use ability can somebody show me how to do it its my first time doing it so dont know what to do i install core 2days ago and also can somebody tell me how to save videos setting every time i get in game it puts me in low settings i wanted to stay at medium settings ty in advance anbody that helps

Ok lets start, do you know how to add a Trigger on a ball?