Unplug the dryer. If the plug can be reached without moving the dryer, the dryer probably won't have to be moved.
Use a putty knife to press the clips holding the lid in place (Image 1). Lift the lid.
Look at the existing belt. If it looks worn (Image 2), it will need to be replaced.
Disconnect the electrical connection for the door switch from the front of the dryer (Image 1). Remove the screws holding the front cover of the dryer in place (Image 2). Lift up the front cover, and pull it off the dryer.
The belt will be threaded around an idle pulley and looped over the drive shaft.
The idle pulley helps keep the belt tight (Image 1).
Place the new belt around the drum so that the rubber surface (Image 2) touches the drum. The rubber surface has ridges that help it keep good traction.
Reach underneath the drum to access the drive shaft (Image 1).
Set the idle pulley in position if necessary. The pulley snaps into two grooves in the cabinet body. Loop the belt under the idle pulley, and attach it to the drive shaft (Image 2)
Replace the front of the dryer, and attach the top by reversing the removal procedure.