Comment entry for the current theme was not active - made it work

Replaced the

<div id='respond'>

        <h4>

        <a expr:href='data:post.addCommentUrl' expr:onclick='data:post.addCommentOnclick'><data:postCommentMsg/></a>

        </h4>

    </div>

with

<p class='comment-footer'>

        <b:if cond='data:post.embedCommentForm'>

          <b:if cond='data:post.allowNewComments'>

            <b:include data='post' name='comment-form'/>

          <b:else/>

            <data:post.noNewCommentsText/>

          </b:if>

        <b:else/>

          <b:if cond='data:post.allowComments'>

            <a expr:href='data:post.addCommentUrl' expr:onclick='data:post.addCommentOnclick'><data:postCommentMsg/></a>

          </b:if>

        </b:if>

      </p>

in the template file of the current theme.
To get an overall idea of how blogger template works have a look at
http://www.blogdoctor.me/2006/10/what-are-widgets.html
http://www.google.com/support/blogger/bin/answer.py?hl=en&answer=46995
http://www.google.com/support/blogger/bin/answer.py?hl=en&answer=46888