Broken power head belt

Not sure which one you have, need complete model number. You can go tosears.com, click on the parts link, enter you model number, click on the powerehead link. A parts list will come up along with a picture breakdown of it.
Alot of them the part covering the light is just snapped into place, push in on the side andback to release it. Remove the 2 screws, use a flatblade and stick in the slot on each side from the bottom and pry up to release it.
The other type, you tak out the 2 screws from the bottom, then on the back and each side are release tabs that you pry out to release.