These feed variables come under the scope of a link, and only apply when a link has a feed. These variables are for each feed item. Feed template varibles go within the <!-- BEGIN FEED --> area (which is itself within the scope of a image), like this:

<!-- BEGIN FEEDS -->
<a href="http://scripts.webmastersite.net/wsngallery/manual/{FEEDLINK}">{FEEDTITLE}</a> by {FEEDAUTHOR} on {FEEDPUBDATE}:
<br>{FEEDDESCRIPTION}
<br>
<!-- END FEEDS -->

{FEEDLINK} - The URL destination of the feed item.
{FEEDTITLE} - The title of the feed item.
{FEEDDESCRIPTION} - The description of the feed item.
{FEEDDESCRIPTIONSTRIPPED} - The feed item description with all HTML removed.
-- Optional parameter: number of characters to cut off at.
{FEEDAUTHOR} - The author of the feed, as credited in the RSS.
{FEEDPUBDATE} - The publication date as credited in the RSS.
{FEEDCANVIEW} - True if the visitor can view the feed, false if not.