İf i open template folder /tpls/blocks/footer.php and rewrite the place with the original footer text cant get the change in to it.

<?php
/**
@package T3 Blank
@copyright Copyright (C) 2005 - 2012 Open Source Matters, Inc. All rights reserved.
@license GNU General Public License version 2 or later; see LICENSE.txt
/

defined('_JEXEC') or die;
?>

<div id="back-to-top" data-spy="affix" data-offset-top="300" class="back-to-top hidden-xs hidden-sm affix-top">
<button class="btn btn-primary" title="Back to Top"><i class="fa fa-caret-up"></i></button>
</div>
<script type="text/javascript">
(function($) {
// Back to top
$('#back-to-top').on('click', function(){
$("html, body").animate({scrollTop: 0}, 500);
return false;
});
$(window).load(function(){
// hide button to top if the document height not greater than window height2;using window load for more accurate calculate.

if ((parseInt($(window).height())2)>(parseInt($(document).height()))) {
$('#back-to-top').hide();
}
});
})(jQuery);
</script>

<footer id="t3-footer" class="wrap t3-footer">

<?php if ($this->checkSpotlight('footer-sl', 'footer-1, footer-2, footer-3, footer-4, footer-5, footer-6')) : ?>
	<!-- FOOTER SPOTLIGHT -->
	<div class="container hidden-xs">
		<?php $this->spotlight('footer-sl', 'footer-1, footer-2, footer-3, footer-4, footer-5, footer-6') ?>
	</div>
	<!-- //FOOTER SPOTLIGHT -->
<?php endif ?>

<section class="t3-copyright">
	<div class="container">
		<div class="row">
			<div class="<?php echo $this->getParam('t3-rmvlogo', 1) ? 'col-md-8' : 'col-md-12' ?> copyright <?php $this->_c('footer') ?>">
				<jdoc:include type="modules" name="<?php $this->_p('footer') ?>" />
      <small>
        <a href="http://twitter.github.io/bootstrap/" title="Bootstrap by Twitter" target="_blank">Heerberg</a> Alle Rechten Voorbehouden <a href="https://github.com/twbs/bootstrap/blob/master/LICENSE" title="MIT License" target="_blank">MIT License.</a>
      </small>
      <small>
        <a href="http://fortawesome.github.io/Font-Awesome/" target="_blank">Heerberg</a> 2018 <a href="http://scripts.sil.org/OFL">copyright</a>.
      </small>
			</div>
			<?php if ($this->getParam('t3-rmvlogo', 1)): ?>
				<div class="col-md-4 poweredby text-hide">
					<a class="t3-logo t3-logo-color" href="http://t3-framework.org" title="Powered By T3 Framework"
					   target="_blank" <?php echo method_exists('T3', 'isHome') && T3::isHome() ? '' : 'rel="nofollow"' ?>>Powered by <strong>T3 Framework</strong></a>
				</div>
			<?php endif; ?>
		</div>
	</div>
</section>

</footer>

Can someone tell me what im doing wrong (i do not know anything about php i just delete the little text and i wrote mine on it and saved)