cant set dfgt buttons

Hi, I downloaded the game and spent my free trial hour trying to figure out how to set my dfgt-wheels buttons as i wish. I cant set any functions on any buttons. Surely Im not supposed to edit a .ini file to do this?

Im using dfgt(without logitech pedals) and csr elite pedals.
Whats the problem?

They also have a 30 day LITE version now to try. As for your button assignment, I can't be of much help as I use a TH TX and I haven't had any problems assigning buttons - you don't need to edit an INI file.
I use DFGT wheel with G27 shifter & pedals with no problems. In the controls menu page you can config any controller, select a function set it to a button or pedal. You must confirm that you want to use it & save all your settings with when done.
Problem solved(thx Trellet). I had too many controllers, namely CH Products joystick etc controllers(5 of them) i tested a while ago, they made 2 Virtual joysticks on my pc. I removed the Ch software and button mapping works now. I downloaded the lite version (thx William Wester) so i can test the product now. Phew, what a relief :) Thanks all.