Hello, I am the Sysop of this Wiki and this is my page.
First, in the Mediawiki:Sidebar Page, prefix the name (not the url) of the page you want to be inflatable with a "+" (i.e. ** news|+News).
Second, place all pages for which this item should be inflated in a matching category, by putting [[Category:<catname>]] (i.e. [[Category:news]] at the end of the page.
Third, one will have to edit some Mediawiki:NavNews or Navlinks:News page, so that the system knows, which items should be listed, but this isn't yet implemented.