Thrustmaster 3-in1 wheel settings

[jjaycee1]

I have just bought GSC but am unable to work out how to set up my racing wheel. When I go into Controls I cannot seem to get any custom changes done e.g. right pedal is brake and left pedal is accelerator where i want to change it to the other way round. I have no problem customizing in F1 2011 nor Need for Speed.
Can anyone help me or advise if my wheel is incompatible with GSC ? Anyone else use Thrustmaster Ferrrari GT 3-in-1 racing wheel and could help.
Many thanks