You can edit the properties of an existing iHomeServer™ Watch Folder in the Watch Folder tab of the iHomeServer Management Console.  Select the Watch Folder at the top (or "root") level of the 'Watch Folder' tab and click the 'Edit' button from the toolbar.  The following dialog will be displayed:

 

 

You can change any of the settings except for the 'Folder path' which cannot be changed.  Please note that the settings you have changed will only apply to new content that is added to the Watch Folder, not any existing content.  You can force existing content to be re-indexed by right-clicking a Watch Folder, sub-folder or file within the 'Watch Folder' view and clicking the 'Reindex...' menu

 

Please see Add a new Watch Folder window for further information about the settings in this window.