To add menu, go to Front CMS > Menus, here by default two menus are given (Main menu, Bottom Menu) then enter Menu and Description and then click on Save button. You can view this added record in the Menu List on the right of the page. To delete menu click on Delete icon present at Action column in the menu list.To add menu item click on Add (+) icon present at Action column in the menu list, at click of this icon Add Menu Item page will be open. Here enter Menu Item, External URL, Open In