Ah ha! It's all in one line in the code, so I missed it. This is what is in my footer template around there. Take a look at your template and you should be able to add it also (probably add it in the same td tag since it's something that never actually gets printed on the site - hopefully it doesn't bring your site down this time!):
Code:
<div align="center">
<div class="smallfont" align="center">
<!-- Do not remove this copyright notice -->
$vbphrase[powered_by_vbulletin]
<!-- Do not remove this copyright notice -->
</div>
<div class="smallfont" align="center">
<!-- Do not remove $cronimage or your scheduled tasks will cease to function -->
$cronimage
<!-- Do not remove $cronimage or your scheduled tasks will cease to function -->
$vboptions[copyrighttext]
</div>
</div>