Hello, saw your questions on my profile. I'm a jQuery guy so I try everything with code but sometimes its best to use CSS. Moving the Nav bar above the header with jQuery turns it into a vertical menu instead of horizontal. So its best done with CSS, try Josh's link. Sub menus - I thought you could do that in the Tab Manager but not sure, i don't use Sub menus on any of my Ning sites. Searching for your network, not sure, probably something to ask help.ning.com. And Josh is right about ads below the footer. Anything added to the Analytics textbox shows up below the footer. Remember that you need to purchase Ning's Premium package to show ads, or you would be in violation of their TOS.
If the Navagtion tutorial didn't work let me know I will see what I can do. For the ad below the footer I have already gave you a code that will work but feel free to E-Mail me at Ning.firstname.lastname@example.org