Hi mrlawrencelam,
You can open the \templates\ja_company\tpls\blocks\footer.php file and find line 20 then replace it with the following code:
<!-- BACK TOP TOP BUTTON -->
<div id="back-to-top" data-spy="affix" data-offset-top="200" class="back-to-top hidden-xs hidden-sm affix-top">
<button class="btn btn-primary" title="<?php echo JText::_('TPL_BACK_TO_TOP') ?>"><span class="fas fa-long-arrow-alt-up" aria-hidden="true"></span><span class="element-invisible hidden">empty</span></button>
</div>
