AdminCP > Styles & Temp > Style Manager > Edit Template > Postbit Templates > postbit ("postbit legancy" depending on which you are using)
If you want to post it under the user's name find
Code:
<if condition="$post['usertitle']"><div class="smallfont">$post[usertitle]</div></if>
after that add
Code:
<if condition="$post['field7']">$post[field7]</if>
Should be it.
SVT