Ditto...I remember seeing the instructions on newtis.info when looking at info about how to change the START button.
If you cant find it on that site...try youtube. I say that because I believe the trim panel that surrounds the center vent & start button has to come off in some of the youtube videos that show how to pop that trim piece off.
Once off, you flip the trim panel and center vent over and remove the screws that hold the two pieces together.
Good luck...remember to post back your success so that others will know how to do it. Take some pics along the way in case it helps other, too.