> I hope the answer to this  is not embarrassingly simple, because
> I just can't seem to find it.

You decide :-)

Go to: http://host/scripts/wa.exe?ADMIN     then...
{HYPERLINK "/scripts/wa.exe?TPLED1=WWW_ARCHIVE&X=*L362E504C3C87253F9A&[log in to unmask]"}Customize  site-wide static web pages and banners      then...

$WWW_ARCHIVE_TRAILER     and edit.