thats the wrong library folder.
you needs to go into the users library folder, the one in your screen shot is the library folder from the root.
On newer version of mac OS, the users library folder is hidden. you can unhide the users library folder using the following command at the terminal:
chflags nohidden ~/Library/
the path to the configuration folder should look like:
/users/<your user name>/Library/Application Support/Adobe/Dreamweaver <version>/Configuration