Enter for ¨Server Address" following server address:
https://box.stepping-stone.ch/remote.php/webdav
Replace box.stepping-stone.ch, with the URL which you have received from us. For example:
https://3731234.stoney-storage.com/remote.php/webdav
Click "+" to add the server address to the "Favorite Servers", for a quick connection next time.
Press "Connect".
You have connected the folder successfully.
Press ctrl + command (⌘) + T to add your folder to the finder sidebar.
Thank you for using stoney storage.