Can't figure out storage directory for Google Drive

Sorry. A bit of a novice here. Used the app once to back up to my nas but I can’t figure out how to use it with google drive. Can’t figure out what the storage directory should be. Your help would be much appreciated. I’m on the trial version if that helps.

The storage directory is just the path of the Google Drive directory. For instance, if you want to back up to a Google Drive directory named storage which is under a directory named test, the storage directory should be test/storage.