Built a Joomla 3.5x website. Focus here is on horizontal menus. Started out with SEO 'unfriendly' URL's ( believe). I believe they originally had a 'ct' in them, and a hierarchy to them. I then tried to add a horizontal menu item, but it would not display in the horizontal menu 'header', at the top of the page below my banner image. All additional attempts to add horizontal menu items results in non-display in the header. Have researched this furiously for an extended period of time. Suggestions or links to explanatory articles?