BELT WON'T TURN THE DRUM

There is a tensioner pulley as well as the drum and motor
It hooks into a slot, usually on the floor of the case, and has a spring that pulls it against the belt to tension the belt.
Broken belts have been known to knock the tensioner out of place, it should be sitting on the floor of the case as should its spring.
There is usually ony one slot for it to sit in, self evident if you know to look for it
loop the belt around the drum.
slide the belt down the drum directly over the motor pulley
loop the belt around the motor pulley
pull the tensioner pulley hard to the end of its travel against its spring
wrap the belt around the tensioner pulley
release the tensioner so the spring pulls it against the belt
rotate the drum by hand to ensure the belt is aligned and does not pull offf the pulleys
reassemble case
dry clothes
its easier than it looks seeing a broken belt in the bottom of the case.
tensioner may be on the bottom run pushing up, or on the top run pulling down