Filter the main menu

Hi Gurify!

Use this as a reference:

if(!function_exists('avia_append_search_nav'))
{
	//first append search item to main menu
	add_filter( 'wp_nav_menu_items', 'avia_append_search_nav', 10, 2 );
	add_filter( 'avf_fallback_menu_items', 'avia_append_search_nav', 10, 2 );

	function avia_append_search_nav ( $items, $args )
	{	
		if(avia_get_option('header_searchicon','header_searchicon') != "header_searchicon") return $items;
	
	    if ((is_object($args) && $args->theme_location == 'avia') || (is_string($args) && $args = "fallback_menu"))
	    {
	        global $avia_config;
	        ob_start();
	        get_search_form();
	        $form =  htmlspecialchars(ob_get_clean()) ;

	        $items .= '<li id="menu-item-search" class="noMobile menu-item menu-item-search-dropdown">
							<a href="?s=" rel="nofollow" data-avia-search-tooltip="'.$form.'" '.av_icon_string('search').'><span class="avia_hidden_link_text">'.__('Search','avia_framework').'</span></a>
	        		   </li>';
	    }
	    return $items;
	}
}

Enfold uses that to attach the search to the menu.

Cheers!
Josue