Not use autonomous rover

hello,
I have a RC Car, Pixhawk 2.1, Futaba 14sg remote control.
I wantto use this car two purpose.

  1. I want to use it with the remote control, but the car engines need to be connected to Pixhawk’s pin(main out). how to set
    how can ı get signal pixhawk main out pins ??
  2. I want to use autonomous,gps.

Turan,

Welcome to ArduPilot. The best place to start is to read the wiki’s First Time Setup section.