I may be having a very blond moment but I have been looking for the answer on how to do this. I keep seeing reference to a Settings folder which for my up to date PS and ACR I don't have. Please put me out of my frustration and tell me how and where I can add ACR presets that I have.
The folder should be in your User Library
To easily see your user library, in the Finder Go menu, press the Option key and then you should see the word Library