As administrator, you must create usernames for each user. You must also assign one of the following three privilege levels for every user, for every Shared Folder on the media vault:
Full access
No access
You can switch out of this mode by going to the Network Settings tab and selecting another mode.
Why switch to
Let's say you store all your financial files on the media vault. All your network users store their music files to the media vault so that they can download songs only once from the Internet. But you don't want all your network users to have access to your financial files. In this case, you would create separate usernames for each user giving them "Full access" to the Shared Folders containing music. You would then assign "No access" to these users on Shared Folders that contain financial files. (See Organize your files.)
User-based