How to change the view of member link in the thread

How do i alter the script so that when you click the username in a post you are taken to his/her profile? And also: How do i disable the link at the ranks?

Try this code:

<tr valign=top class={$bg}>
<td class=caption1><a name="{$anchor}" href="{$main_url}/{$indexphp}action=userinfo&amp;user={$cc}"{$nof}>
<span class=username>{$posterName}</span></a><br>
<span class=txtSm>{$ins}</span>
<br><br>
</td>

Thanks a lot! It worked!