How to Hide the "Kiyoh Settings" Admin Menu

function plt_hide_kiyoh_customerreview_menus() {
	//Hide the "Kiyoh Settings" menu.
	remove_menu_page('kiyoh-customerreview/kiyoh-customerreview.php');
}

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

Where do I put this code?