You can select your vehicle type using QGroundControl.
After starting QGC go to the
Vehicle Setups menu and there choose
Vehicle Setup Settings you can set one of the following vehicle types:
After choosing the required type of vehicle click on
Apply and Restart button. A confirmation window will appear
Apply button Edge will restart with the selected ArduPilot binary. QGC will
disconnect from the autopilot after some time.
QGC should reconnect to Edge if you have enabled AutoConnect for UDP
Airframe Setup is only available on ArduCopter vehicles
There you may choose Frame Class (Quad, Hexa, Octa, etc) and Frame Type (Plus, X, H, etc) of your copter.