How to Hide the "Downloads Statistics" Admin Menu

function plt_hide_seraphinite_downloads_stats_menus() {
	//Hide the "Settings → Downloads Statistics" menu.
	remove_submenu_page('options-general.php', 'seraph_dlstat_settings');
}

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

Where do I put this code?