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
Ok, I followed the steps got to the right path, and deleted the file per the instruction. Now when I try DataAssist, I get this error: At line 123 of file "WA_AppBuilder.js": WADA_Carbon.checkSerial is not a function