Adding a Menu Entry for a Single Article in Joomla! 1.0.x
In the Joomla! Administrator (www.yoursite.com/administrator), select Menu->Menu Manager or Click on the Icon Menu Manager.
Click on the mainmenu radio button and then the Menu Items icon underneath the Menu Items title.
Once in the Menu Manager click on the New button
In the New Menu Item page click on Link – Content Item [Creates a link to a published Content Item in full view] and then click on Next
In the Add Menu Item :: Link – Content Item page enter a Name for the menu item. In the Content to Link box select the content that you want to have displayed once someone clicks on the new menu item. You can also select if the page needs to open in the same window or in a new window with Browser or without Browser navigation. And you can also choose if you need a Menu Image. Click on Save.
The Menu Manager for mainmenu reappears. Our new menu item is listed at the bottom. Return to the Front Page of your website and the newly created menu will appear.