Customizing Subnavigation Links for the ARTICLES Navigation tab

[MacroPhotoPro]

Hello;

How do I create custom sub-navigation menu links for my Articles Navigation Tab in vBulletin 4.2? I have custom pages that I want linked.

I can do this in the Navigation Manager for other Tabs (Blogs / Forum, etc.), but I can't seem to find a way to do this for my Articles Tab.

This is the message I get when I try to edit through the Navigation Manager:

You cannot add navigation elements to the CMS using the Navigation Manager, it has its own system for displaying links.

What, exactly does "it's own system" mean, and where to I go about implementing it?

Thanks!