Frontpage:

To delete this info box, click inside this cell, go to Table in the top menu, then to Select Table and press CTRL-X to delete the box.

Other:

Delete the entire section of code, it may look like this:

<table border="0" cellpadding="0" cellspacing="0" style="border-collapse: collapse; " bordercolor="#111111" width="98%" class="news">
<tr>
<td width="100%">
<p align="center"><b>Info Box</b></p>
<p align="center">Use this handy table to inform
your visitors of important updates or news.<br>
<br>
<a name="To delete this info box,">To delete this info box, </a>
click inside this cell, go to Table in the top menu, then to
Select Table and press CTRL-X to delete the box.</p>
</td>
</tr>
</table>