Changing Colors of New Posts need advice

[Goat Boy]

In the threadbit template I found this code

<a href="showthread.php?$session[sessionurl]t=$thread[threadid]
$thread[highlight]" id="thread_title_$thread[realthreadid]"<if condition=
"$show['gotonewpost']"> style="font-weight:bold"</if>>$thread[threadtitle]</a>

I believe this is the area I can change the color of new posts that are bold right? If this is correct where do I add the code to change the color. Either it changes the colors of all the posts new and old or it doesn't change anything. So obviously I am not doing it right.

Thanks