You do not have a link list with a handle set to fullers-sets-splitters-aus-nz-store, or you do and it's empty. Go ahead and create a link list called fullers, sets & splitters "AUS/NZ Store" 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 fullers-sets-splitters-aus-nz-store.