The Air Boss station has to be enabled as a SC option in the mission editor, and then once in the mission, you have to select the air-boss station at the briefing page. It's a stand-alone slot. You can't switch back and forth while you're flying basically. Once you are in it, use "lalt-c" to bring up the cursor, and when it turns green over a screen, right click on your mouse to zoom in and interact with any option keys it has.