mlb550

I'm new to the 2009 CLS550 but i've done my home work and i'm trying to figure this out. I went through the manual and it seems fairly straight forward how to check the tire pressure of all tires through the instrument cluster. I go to the main menu press the up/down menu to get to the tire pressure menu...it then says press the menu right button...well....what button are they talking about??? I've tried just about everything and I couldn't get to see the current tire pressure values (my TPMS warning light came on which is why I was checking). I reset the light and everything seemed fine but I STILL can't access the current psi for the tires on the car...can anyone please help me with this...I would be GREATLY appreciative.