Hello I played freerider with the keyboard with a friend licence and I have been almost good but I wanted to ask if it was possible to change keyboard touch for the throttle and others

It is not possible to change the keyboard setup, the keyboard is basically just for testing purposes only. It will be very difficult to fly in any reasonable realistic/controllable manner with keyboard control. Even an Xbox or Playstation gamepad (or similar, with two analog nubs) will be a lot better, if you happen to have that laying around. But for best control and realism I recommend flying using an actual RC radio connected to your computer.