Where is this 'navigation' option.  It doesn't exist.   Every enaswe rto the simple task of adding submenus, categories etc, to a main menu is inaccurate as they all say to go to online store/navigation.  And the answer if its not there it to reinsta...

Thank you!  This worked great for me too. After searching online and chats and everyone just pointing to 'navigation' (there is nothing like that), or to do the equivalent of clearing your cache, this is the solution.