How can I use the desktop clients to edit the documents I have stored in Koofr?

First, you need to Enable the Network drive in Koofr desktop client Settings. Read more about it in How do I map Koofr as a network drive. Mapping Koofr as a network drive allows you to access Koofr directly from your computer. Koofr will appear as a disk drive on your computer. This way you can edit documents on your computer, with your usual document editor and this will be directly reflected in Koofr WebApp.