If you are referring to switching from metric, I don't know of any user available settings for that. That doesn't mean it's impossible, just that I haven't found it. You may want to contact your dealer.
If you are just having trouble finding the tire pressure display, press the info button until "tire pressure" is displayed. then, press the sel/reset button. That should display the tire pressure for the 4 tires.
This is based on my '11.