In the template code, search for <data:post.body/> using your browser's find feature (commonly in Edit > Find)
Right after that line, paste the following code:
<!-- Add to Any Share/Save BEGIN -->
<br/><a class='a2a_dd' href='http://www.addtoany.com/share_save'><img alt='Share/Save/Bookmark' border='0' src='http://static.addtoany.com/buttons/share_save_171_16.gif' width='171' height='16'/><p class='a2a_linkname_escape' style='display:none'><data:post.title/></p></a><script type='text/javascript'>a2a_linkname_escape=1;a2a_linkurl="<data:post.url/>";</script><script src='http://static.addtoany.com/menu/page.js' type='text/javascript'></script>
<!-- Add to Any Share/Save END -->
