Welcome to the forums.
There are a couple of possibilities with this:
1. Get rid of the logo and clickable area completely (my
personal preference). To do this, go to
this
page on RoboWizard's site and download PBGoneX5.zip. It
contains an empty .swf that you can place in your skin files.
(Don't ask me how Rick did it.)
2. (Requires Adobe Flash.) Edit skin_aboutbox.fla to do what
you want. Additionally, you could edit skin_tb_poweredby.fla to
change what the "Powered by RoboHelp" button says.
With option #1, if you have Flash, you could add a company
image to the toolbar (skin_background_tb.fla). I've added an image
to the left side and then opened all the toolbar button .fla files
and shifted each button far enough to the right that they aren't
sitting over the top of the image.
--Ben