The Sirius Radio is a unit that add's on to the head unit. While all the compatible cars shipped with the "sat" button, it wont do anything unless you have the Sirius module installed. If it was installed, it should switch your screen, and you should be able to access channel (i think) 199... which is the free "news" channel, and if nothing changes on the screen, then you most likely dont have it installed.
Welcome to the forums, and congrats on the purchase.
Welcome to the forums, and congrats on the purchase.