magnet settings are used when there's a crank sensor, different ones have more or fewer magnets, some just have a single magnet and sensor on the back wheel. probably doesn't need changing. Not sure about 6, probably how quick the assist kicks in when movement sensed by magnets.
Await a proper explanation form a competent adult though!
ps, save your original configuration if you are fiddling about, either write it all down or export it to a laptop, if you are fiddling using a USB lead and program on laptop.