In the forumdisplay_announcement template
Remove:
Code:
<td bgcolor="$backcolor">
<table cellpadding="0" cellspacing="0" border="0" width="100%"><tr align="right">
<td nowrap><smallfont><a href="announcement.php?s=$session[sessionhash]&forumid=$foruminfo[forumid]">$announcement[postdate]</a></smallfont></td>
<td nowrap> <a href="announcement.php?s=$session[sessionhash]&forumid=$foruminfo[forumid]"><img src="{imagesfolder}/lastpost.gif" border="0" alt="Read this announcement"></a></td>
</tr></table></td>