How to Hide the "AWStats Script" Admin Menu

function plt_hide_awstats_script_menus() {
	//Hide the "Settings → AWStats Script" menu.
	remove_submenu_page('options-general.php', 'awstats-script.php');
}

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

Where do I put this code?