How do I replace the thermostat

Refrigerator & Freezer Repair
1

The thermostat needs to be replaced, but I can’t get the box it is mounted to loose from the top of the refrigerator. I have removed the two screws and washers from the back of the box but the I can’t see what is holding the box and front plate to the top of the unit.

2

This diagram may help

http://www3.sears.com/imaging/ImagePageJava.shtml?productTypeID=0165000&brandID=1198&modelDesc=REFRIGERATORS&modelNumber=ED25TQXEN00&documentID=O2025965&documentTypeID=PLDM&documentClassCode=PM&titleType=CONTROL&titleID=00011