• To Remove the copyright information altogether, you could remove

 <?php include_once( $GLOBALS['mosConfig_absolute_path'] . '/includes/footer.php' ); ?>

from /yourtemplatename/index.php .

You can alternatively, add something here like a link, if you wish. Example;

 <a href="http://www.google.com/">Google</a><?php include_once( $GLOBALS['mosConfig_absolute_path'] . '/includes/footer.php' ); ?>