How to Hide NS Cloner - Site Copier Admin Menus

function plt_hide_ns_cloner_site_copier_menus() {
	//Hide the "NS Cloner" menu.
	remove_menu_page('ns-cloner');
	//Hide the "NS Cloner → NS Cloner" menu.
	remove_submenu_page('ns-cloner', 'ns-cloner');
	//Hide the "NS Cloner → Logs / Status" menu.
	remove_submenu_page('ns-cloner', 'ns-cloner-logs');
}

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

Where do I put this code?