The Admin tab explained

The Admin tab is the first tab under Settings. The settings here apply to the admin area, and to admin users.

Only administrators can change the settings on this tab.

1. Filter allows you to reduce the number of fields displayed to make it easier to find. 
    
2. Enable visual confirmation to login controls whether a user has to type a confirmation code
   e.g.
   before they can log on.
   
   
3. The Security / Privacy settings control user logons.

• Session expires (in minutes) controls how long before the user is automatically logged out when they do not use the system. In the example above, users will be logged out if they do not use the knowledgebase for two hours. If you wish to turn automatic logout off, set this to 0.
  
  
• If you want the user to type in their old password to allow them to change to a new one, check Old password required to change password.  If you don't check this, then the user can change the password without typing their old one.

4. Look & Feel (settings) control how the admin area is displayed.

• Box width controls the width of the frame in which the administrator screen is displayed. You can set the width in either pixels (in the screen example it is 980px), or as a percentage of the width of the user's screen (e.g. 90%).
• Default number of records displayed on a page is the number of records on a page that is first displayed when a user goes to that page. The user can change the setting manually while they are on the page.
• Sort articles by sets up the default sort order articles are displayed in. Sort can be alphabetic, or by date added or modified. Users can override these settings if they prefer a different sort order.
• Likewise, sort files by sets up the default sort order files are displayed in. Again, users can override these settings with their own personal display order preference. 

5. The HTML editor file directory tells the knowledgebase where to look for the files that you attach as images or links to articles. That is, when you, say, insert a picture into an article, this is where the picture will be found or uploaded.
   
   
6. You can also set up automated reporting of errors by selecting send critical messages to admin. This means that if your knowledgebase has critical errors in scheduled tasks, the administrator will receive an email stating that there were problems with the cron jobs and can quickly log on to fix it. The email address that errors are sent to is that of the email administrator defined in the Email settings tab.
   
   
7. The Article settings history and autosave settings for individual articles.

• The maximum number of revisions controls how many revisions are stored for a document. If you set this to, say, 5, then on the sixth revision the earliest version is deleted, overwritted by the new one. If you don't want to keep article history at all, make this 0.
• KBPublisher can automatically save your article changes at nominated intervals. Autosave recovery information every sets the number of minutes between autosaves. If you make this 0, you turn autosave off.

8. Set defaults resets your settings back to the KBPublisher defaults.

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Some functionality mentioned on this screen works in version 3.5 only or has been changed for version 4.0.
For a complete list of changed/new functionality, please see version 4.0 release notes