Step by step instructions

1. In the administration menu go to Site Building -> Menus
   
2. Click on Main
   
3. At the top click on Add Item
   
4. Under Path enter the url of the site you would like to link to.
5. Under Menu link title enter the name that is to be shown on the menu.
6. You may enter a description for the menu item
7. Choose it's parent.
8. You may leave the weight alone.
9. Click Save.