On the main page (the second one in NAV) if you push the right iknob it will display a cursor. If you forget, the knob says PUSH/CRSR. You control the cursor with the same knob (big part for right/left, small part for up/down). Once you've moved the cursor into an area of airspace (like a shelf of a Bravo, MOA, etc) you can push ENTER and it will display stats for the airspace including altitudes and what kind of airspace it is as well as the name.

You can do the same thing to ID airports, navaids and the like. I often scan ahead of my route and if I see something I'm unfamiliar with or need to know if I'll be in or under a Bravo, I'll highlight it and check. Takes just a few seconds. And when you get done, you just push the knob and it will re-center the map on your aircraft.