You need to add some HTML to your postbit template in order for it to show up there. For example, something like:
HTML Code:
<vb:if condition="$post['fieldX']">
<dt>Field Name/Description</dt><dd>{vb:raw post.fieldX}</dd>
</vb:if>
where "Field Name/Description" is the name of the field and "X" is the field number. Look for the dl element with class="userinfo_extra" and add the HTML at the appropriate location, depending on where you want it to display with respect to the other data there.