Follow the large hose coming out of the top of the radiator. That should take you to the thermostat housing. You need to place a container under the drain spigot on the radiator and drain a gallon or so of coolant from the radiator so that coolant doesn't run out when you remove the housing. Remove the housing (usually don't need to remove hose) and scrap clean both surfaces of the housing and the block. Take not of the position of the gasket and thermostat you are removing. Replace thermostat, put a small amount of gasket sealing material on both surfaces, put new gasket on and tighten the housing back down. Some engines have a small plug in the housing. You have to remove the plug as you replace coolant back into the motor until you see coolant running out of the hole and then put the plug back in.
Here is a video that show the gist of changing one.
http://www.youtube.com/watch?v=RIC6Z4D6Q3E
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