foundation-topbar-menu.php and foundation-topbar-walker.php should be required in the WordPress functions.php file.
The code in foundation-topbar.php should be added below the body tag in header.php
Setup a menu in WordPress admin under Appearance > Menus
Use the 'label' class on a menu item to create a menu section title
Foundation Top Bar Doc: http://foundation.zurb.com/docs/components/top-bar.html
I'm using F5 also. I have the navigation working but when it gets to a smart phone screen it doesn't work for some reason. Any ideas why?
** I FOUND THE FIX. If you downloaded Foundation 5.0.0 then you will have issues. If you download 5.0.1 or 5.0.2 it will fix it for you.