Admin Forum:How to edit the drop-down menu bar - On the Wiki etc

I have created a Wiki page so now I want the pages to be linked together and to be able to list them from the menu bar. When I look at the Contribute options, edit Navigation, it doesn't give me the option to edit all the menu bar, nor does it give any hint as to the syntax of menu bar editing. How do I edit the drop down menu for my wiki site (not the fixed one at the top of the screen) so I can add links to my wiki page?