Edge cts insight how to change tunes?
 

OK so I'm new to diesels and just bought a 2002 f250 ccsb. It has a edge cts insight on it and has a little knob hanging from the steering wheel that does connect to the monitor. My question is that when I try to change tunes I don't have an option to do so on the monitor, and honestly not sure what this knob even does either. I've turned it but the monitor doesn't change power levels it just stays at I. How do I change tunes on this thing? What will I need to change tunes if need be?