DiRT Rally help to change program files

[SpeedFreakGT]

I have the sim dash to run my tach and for dirt rally it says I need to go into config which I did and change the false to true.
now if I highlight false I cant edit it at all. then I right click and go to source I change the false to true and the 0 to 1 but I have no way to save it. control s doesn't work
any ideas? I'm new to all this but I have changed files in other games and I just highlighted the false, hit backspace and entered true but on this game that doesn't work.

well I figured out how to edit it but it still didn't make it work so oh well I'm not gonna sweat it

 

[Bram Hengeveld]

Are these files that can be opened in notepad @SpeedFreakGT ?

 

[Sil]

the .xml files are good to be open with notepad and gets saved, no prob here.