Theme Horse

Hello Kai,
My WP version is on line at the host. How can I acces and adjust the Po file? I can’t find it.

In my site http://www.stichting-sz.nl/ I find the searchform.php:

<?php
/**
* Displays the searchform of the theme.
*
* @package Theme Horse
* @subpackage Ultimate
* @since Ultimate 1.0
*/
/**
* ultimate_searchform hook
*
* HOOKED_FUNCTION_NAME PRIORITY
*
* ultimate_display_searchform 10
*/
do_action( ‘ultimate_searchform’ );
?>

That;s all. Nothing there that I can adjust. How to open this ‘ultimate_searchform’?