For about 3 years I was running my setup using a Macbook Pro and it was alright when running American Truck Simulator until I wanted to change some config files on it. for hours I was trying to figure out how to get to it but never know how and until recently I discovered it. When opening up your finder there are two key keys (get it) in order to get to the files, click command+shift+G and a bar will show up, in there you will type "~/Library/Application Support" and click enter (note: on a windows keyboard command is just the windows key). Then you will find several files, one of them should be ats, double click and you will find not only your config file but your mod file, your profile file, and more important places... or you could just get a pc like I did.