How to Hide the "JCH Optimize" Admin Menu

function plt_hide_jch_optimize_menus() {
	//Hide the "Settings → JCH Optimize" menu.
	remove_submenu_page('options-general.php', 'jch_optimize');
}

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

Where do I put this code?