Just to add a couple of things:
I'm assuming that the "Footer" checkbox under "Menu Settings" on your menu admin page does not give you the results you want - i.e., you want the menu to be in the dark part at the very bottom of the page instead of riding on top of the dark part.
To center your new menu in the right half of the footer, you can add to the ul.footer-menu section of your stylesheet:
`text-align: center;'
And change the display: inline
to display: inline-block
in the li.footer-menu-horz section.