To modify or add text to the site footer, change the "Footer" section of index.php in the templates/protostar directory:

	<!-- Footer -->
	<footer class="footer" role="contentinfo">
		<div class="container<?php echo ($params->get('fluidContainer') ? '-fluid' : '');?>">
			<hr />
			<jdoc:include type="modules" name="footer" style="none" />
			<p class="pull-right">
				<a href="#top" id="back-top">
					<?php echo JText::_('TPL_PROTOSTAR_BACKTOTOP'); ?>
				</a>
			</p>
			<p>
				&copy; <?php echo date('Y'); ?> <?php echo $sitename; ?><br>
			</p>
		</div>
		<div align="center">
			<p>
				Web site design by <a href="http://sebtombs.com">Sebastian Tombs Enterprises Ltd</a> 
			</p>
		</div>
	</footer>