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On this vehicle, the Thermostat is built into, and part of the thermostat housing. So you replace the housing as a unit. THe housing will come with a new thermostat and gasket.
Disconnect the heater hose from the thermostat housing.
Disconnect the lower radiator hose from the thermostat housing and remove the thermostat housing.
It should be accessible from the engine compartment. Towards the top of the engine, and towards the passenger's side. (red arrow, #5 in image below) (Click "view full image" on the image above/below to get a pop-up window with a close-up view of the location)