Check out this instructional home repair video to learn how to identify the model number on your washing machine and dryer. Knowing the model number can be essential in finding the right replacement parts. People make the mistake of assuming that the name and number on the front panel is all you need; many washing machine and tumble dryer manufacturers use the model number as well as the serial number. Most washers and dryers have the ID plate behind the door or on the inside of the door. Some hide it behind the kick plate at the base. Be careful if removing the front kick plate because they can easily break.
If you still can't find it, check behind the pump filter flap. Other than that you would need to check the sides and back of the machine.