Either one of 2 ways to get to the thermostat on a GE dryer.....
depending on your model, you will have an access point on the back of the dryer to get to the heating element which has attached to it, the thermostat.
If there isn't an access point on the rear of the unit, open the front door of the dryer and remove the 2 screws in the top of the door opening. Using a small prybar, slightly apply pressure prying up the lid. On the inside of the face of the dryer in the corners will be 2 more screws, remove those and pull the face of the dryer outwards to you to about a 45 degree angle. From there, you will be able to lift off the face. Be cautious to unplug the wires for the door switch before pulling the face all the way out. There isn't much to a 10 yr old dryer, just take your time, study the parts and put it back just as you took it apart. For the replacement thermostat or heating element look at