Edit the adv_portal_newsbits template.
Remove this code:
<tr>
<td align="$stylevar[left]" class="alt1" valign="top">
<if condition="$news['avatarpath']">
<img align="$stylevar[left]" style="padding:6px" alt="" border="0" src="$news[avatarpath]" title="$news[postusername]'s $vbphrase[avatar]" />
</if>
$news[message]
<if condition="$show['signature']">
<div>__________________<br />
$news[signature]</div>
</if>
</td>
</tr>
<if condition="$news['attachment']">
<tr class="alt1">
<td>
<fieldset class="fieldset">
<legend>Attached Files</legend>
<div style="padding:$stylevar[formspacer]px">
$news[attachment]
</div>
</fieldset>
</td>
</tr>
</if>
<tr class="alt2" valign="middle">
<td valign="middle">
<span style="float:right">
<if condition="$show['editbutton']">
<a href="$vboptions[bburl]/editpost.php?$session[sessionurl]do=editpost&p=$news[postid]"><img alt="$vbphrase[edit_this_post]" border="0" src="$stylevar[imgdir_button]/edit.gif" /></a>
</if>
<if condition="$show['replybutton']">
<a href="$vboptions[bburl]/newreply.php?$session[sessionurl]do=newreply&t=$news[threadid]"><img alt="$vbphrase[reply_to_this_post]" border="0" src="$stylevar[imgdir_button]/reply_small.gif" /></a>
</if>
<if condition="$mod_options['portal_news_showsendfriend']">
<a href="$vboptions[bburl]/sendmessage.php?$session[sessionurl]do=sendtofriend&t=$news[threadid]"><img alt="" border="0" src="$stylevar[imgdir_button]/sendtofriend.gif" title="$vbphrase[send_to_friend]" /></a>
</if>
<if condition="$mod_options['portal_news_showprintable']">
<a href="$vboptions[bburl]/printthread.php?$session[sessionurl]t=$news[threadid]"><img alt="" border="0" src="$stylevar[imgdir_button]/printer.gif" title="$vbphrase[show_printable_version]" /></a>
</if>
</span>
<span class="smallfont">
<if condition="$mod_options['portal_news_allowreplies']">$news[replycount] <if condition="$news['replycount'] == 1">$vbphrase[reply]<else />$vbphrase[replies]</if> | </if> $news[views] $vbphrase[views]</span>
</td>
</tr>