Where is the thermostat located and how would I replace it? on 2007 Ford Fusion

My 2007 Ford Fusion has a diagnostic code of P0128 which comes back as needing the low coolant or that the thermostat is bad. The coolant isn't low though.

Asked by for the 2007 Ford Fusion
Autozone have some popular workshop manuals for free on line once you register (for free) on their website There is a company that independent auto repair shops get their information from, this same information is available inexpensively for people that work on their own cars.. The information is year make and model specific, covering repair procedures, torque specifications, fluid capacities and specifications, service bulletins, component locations, wiring diagrams ect.... Alldata is very easy to navigate
thank you. I am going to attempt to do it myself b/c I have a sorry ass husband and I am tired of waiting for someone to do it and the dealer is trying to charge me 250.00 I really don't have.