In SHOWTHREAD template find:
Code:
<if condition="$show['pagenav']"><td align="$stylevar[right]">$pagenav</td></if>
</tr>
</table>
<!-- / controls below postbits -->
after this, add:
Code:
<div class="smallfont" align="center">
<a href="$vboptions[forumhome].php?$session[sessionurl]">$vboptions[bbtitle]</a></span> $navbits[breadcrumb]</div>
Adjust html to suit your needs.