So you use Graffiti for your content management, but you want to create top level links on your site to a non-Graffiti page.  This is easy to to.  Lets pretend, in my case, that I want to create a top level link to my personal site ledgards.com from EvolvingWe.com.   

1. Open the control panel on your site as a site administrator. 
2. Click the presentation tab.
3. Click Navigation
4. Click the custom links sub tab.
5. Add the text for your link and the link itself
6. Click add to Navigation
7. Position the link where you want it in the navigation links control.