How do you replace the thermostat located on a 1993 Acura Integra?

If you are talking about the engine coolant stat you need to follow the lower radiator hose towards the engine. Before removing anything the engine must be cool and the coolant has to be drained. If this is met remove the hose and the coolant temperature sensor. Then remove the two bolts on the thermostat housing. Remove the stat and replace. Replace the hose and sensor. When replacing engine coolant you must bleed out ALL air. This can be done by the bleed plug at the cylinder head. Just loosen and retighten when all air is removed. If any questions arise you can pick up the Haynes Manual from most Parts stores. I think it is better for pictures and explanations.