Replaceing Belt

I want to replace the belt in my dryer but cannot find a repair manual. I need to know how to open the box to gain access to the area. The motors turns, dryer heat is on, but the drum won’t turn. Exhaust hose is clean. Noises normal. Any help would be appreciated.

Model Number: FDE437GHS0 Brand: Frigidaire
Thanks for the advice to replace belt. Put the dryer back together with no left over parts and no unconnected wires. Plugged into wall. Turned ON, no response. Rechecked the Wires and breaker. Turned ON, no response. What do I do now? Is there a reset button some where?
Any help would be appreciated.
JamieM

Remove the tub:[ATTACH]414[/ATTACH]It is hard to read but the thermal fuse it in the upper right hand corner. If it is open then the dryer will not run.It is rather small about the size of a dime.

Thanks-you guys,
It was the door switch. Dryer works like a charm.
JamieM