[Beermonster]

You could use something like this in your header template

<if condition="is_member_of($bbuserinfo, 1)">
<br />
<table class="tborder" cellpadding="$stylevar[cellpadding]" cellspacing="$stylevar[cellspacing]" border="0" width="100%" align="center">
<thead>
 <tr>
  <td class="tcat" style="color: white;">
   Unregisterd User 
  </td>
 </tr>
</thead>
<tbody>
  <tr>
<td class="alt1" align="center">

PUT YOUR TEXT HERE

</td>
  </tr>
</tbody>
</table>
<br />
</if>

Where $bbuserinfo, 1 is change the number to the group you want it to be displayed to