To add a new menu/tab to the WordPress toolbar, you need to simply copy and paste the following code in your theme’s functions.php file.
add_action( 'admin_bar_menu', 'add_toolbar_link_top', 999 );
function add_toolbar_link_top( $wp_admin_bar )
{
$args = array(
'id' => 'your-id',
'title' => 'Your Title',
'href' => site_url(),
'meta' => array( 'class' => 'your-class-name' )
);
$wp_admin_bar->add_node( $args );
}
This code will add new menu in WordPress toolbar.
Have any doubt, then comment here!