You realize that they are just looking to change the blue-bar above the reply - the one that has the date/time of the post (that is what they asked for in the post above the one I wrote out the template change). Is that what you are trying to change? If so, as I said in my post it is a line right near the top of the postbit(_legacy) that normally is class thead. So, this line in red:
Code:
<tr>
<td class="thead" $post[scrolltothis]>
<div class="normal" style="float:$stylevar[right]">