Hello,
Just open up the template's index.php file and look for the following at the bottom and you can just delete this:
<?php if($s5_logo_type != "none") { ?>
<div id="s5_logo_wrap2">
<img alt="logo" src="<?php echo $s5_directory_path ?>/images/s5_logo_bottom.png" onclick="window.document.location.href='<?php echo $LiveSiteUrl; ?>'" />
</div>
<div id="s5_logo_right"></div>
<?php } ?>