How to Hide Quick Ajax Post Loader Admin Menus

function plt_hide_quick_ajax_post_loader_menus() {
	//Hide "Quick AJAX".
	remove_menu_page('qapl-menu');
	//Hide "Quick AJAX → Shortcodes".
	remove_submenu_page('qapl-menu', 'edit.php?post_type=qapl-creator');
	//Hide "Quick AJAX → Add New".
	remove_submenu_page('qapl-menu', 'post-new.php?post_type=qapl-creator');
	//Hide "Quick AJAX → Settings & Features".
	remove_submenu_page('qapl-menu', 'qapl-settings');
}

add_action('admin_menu', 'plt_hide_quick_ajax_post_loader_menus', 11);

Where do I put this code?