Flight modes M/P

I have had a iris now for about 2 months and have got pretty good at flying stability and altitude hold modes relatively well. I have also used the loiter and ran a few missions. I would like to try a few different flight modes. I’m a little unsure on how to change them. Is it just a matter of changing one of the 6 flight modes in mission planner? For instance changing stability to drift? Or alt hold to drift or hybrid? Any change need to be done to the radio?

@bosshoss ,
Here is a link to everything you have ever wanted to know about the Flight Modes: http://copter.ardupilot.com/wiki/flight-modes/

I appreciate that