How do I install at thermostat and where is it ?
a Hayne's manual for your specific car. These helpful guides for the do-it yourselfer can be found at basically any Meijer type store as well as any of the auto parts chains such as Advanced Auto, Auto Zone, Pep Boys, etc. With a car as new as yours I'm sure you won't have an issue finding one. Then look in the index in the back and reference thermostat and you may have found yourself the directions to replace that part on your car. Good luck, keep us updated.
Ditto what Flame Roller said. On top of that, read this http://www.car-forums.com/talk/showthread.php?t=2200 and pay special attention to... all of it.