How to Hide WibStats Admin Menus

function plt_hide_wibstats_statistics_for_wordpress_mu_menus() {
	//Hide "Settings → Blog statistics settings".
	remove_submenu_page('options-general.php', 'wibstats-options');

	//Hide "Blog statistics".
	remove_menu_page('wibstats');
	//Hide "Blog statistics → Blog statistics".
	remove_submenu_page('wibstats', 'wibstats');
	//Hide "Blog statistics → Searches".
	remove_submenu_page('wibstats', 'wibstats-searches');
	//Hide "Blog statistics → Referrers".
	remove_submenu_page('wibstats', 'wibstats-referrers');
	//Hide "Blog statistics → Direct visitors".
	remove_submenu_page('wibstats', 'wibstats-direct');
	//Hide "Blog statistics → Pages".
	remove_submenu_page('wibstats', 'wibstats-pages');
	//Hide "Blog statistics → Locations".
	remove_submenu_page('wibstats', 'wibstats-locations');
	//Hide "Blog statistics → Times".
	remove_submenu_page('wibstats', 'wibstats-times');
	//Hide "Blog statistics → Environment".
	remove_submenu_page('wibstats', 'wibstats-environment');
}

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

Where do I put this code?