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Page element > add a gadget > Html/Javascript
Paste this code below inside the box

<script style=text/javascript src=http://www.freewebs.com/filer/blogger/rc1blogger.js ></script><script style=text/javascript >var a_rc=6;var m_rc=true;var n_rc=true;var o_rc=100;</script><script src=http://WidgetsComment.blogspot.com/feeds/comments/default?alt=json-in-script&callback=showrecentcomments ></script>

Remember to Change the Code in red with your Blogger id

Then save.