You do not have a link list with a handle set to military-1-72-1-76-kits, or you do and it's empty. Go ahead and create a link list called Military 1:72 / 1:76 Kits on your Navigation page and populate that link list with links that point to collections, to see collections listed here. Make sure the link list also has a handle set to military-1-72-1-76-kits.