New Release: Pilot's Boeing B314 "The Clipper" Flying Boat

Can someone explain how the Propeller RPM box works? I’ve tried to adjust to Low RPM following the start up procedures in the manual but it doesn’t seem to do anything.
Also I’d like to know how do you navigate with the radios?
There is an external power options, but how do you take advantage of it If you can’t dock anywhere.
Also the version in the marketplace does not come with extra water runways.

A good tutorial of this plane would be great.