Save Files in Steam games

I have been trying to gain access to my game files for modifications and such and I've been unable to find them on my mac, everywhere I look I see people saying look for /USERS/[USERNAME/LIBRARY/APPLICATION SUPPORT/STEAM but I can't find the steam file there, and when I get to the steam common through the profile number and look for the Game ID I don't see anything but a program I'm guessing (because I'm no coder) is rosetta 2. if anyone could help me access my savefiles it would be greatly appreciated