Can't add more menu and Add top menu

Hi ,
I found problem when I add submenu on the main menu.
Please see the website, the last menu has language menu with icon,
should be more menu under Korea but when I add more the menu goes automatically deselect
Theme Locations “Main navigations” in the menu options.
It won’t allow me to add menu??..

Also I created a menu want to display on the top ( not contact menu on the top).
e.g about us | privacy | contact us.

Is there any option to display the menu on the top??..

Thank you in advance