There are several ways you could accomplish it, but there’s not going to be any simple 1-steppers that are going to put the menu exactly where you want it. You need to hook the menu where you want and then style it to work in that location.
If you’re uncomfortable creating your own function that contains wp_nav_menu to output your menu location, you could just use the theme’s default function and move it.
You can look at the action map, but I’d imagine the logical place to put it would be the “themeblvd_header_addon” hook.
// Remove default menu from "themeblvd_header_menu" action remove_action( 'themeblvd_header_menu', 'themeblvd_header_menu_default' ); // Add default menu function to "themeblvd_header_addon" action add_action( 'themeblvd_header_addon', 'themeblvd_header_menu_default' );
But that’s just going to get the HTML markup in the right place. From there, you’re still going to have to style everything to be positioned where you want with CSS.