My website is showing two blog menu items? Above menu and in the menu items!
I want to remove blog item which is showing above the menu?
Your website is in offline-mode, so it's not possible to know what's going on.
However, the Helix3 template has a menu system that is configured in the template settings, and my guess is that you have one or more menu modules in addition to the default menu loaded by the template framework.
Go to your module manager (Extensions - >Modules), and filter the modules by Type -> Menu:
Unpublish any module that could be displaying your main menu.
You can always remove/unpublish any menu item from Menu Manager > Menu Group(Main menu) > individual menu.
You can try ThemeXpert Joomla templates that comes is a easy-to-use mega menu.