How do I add in a site wide navigation menu?
When adding in site menus, we recommend checking out the copying and paste feature, this will save you time as you will need to apply the same menu across different pages. http://youtu.be/xE3Sf9Vmek4

If needed, you may also wish to check out the drop down menu. This is one of the widgets in the free HTML Egg widget template app.
http://youtu.be/S9kkbcg_6b4