Hi,
You can ask here in forums or also send an email to support (at) kentico.com. Email support is guaranteed, the forums are also suitable for Free edition users and give space for discussion and cooperation among users.
Regarding the redirection:
If you need to redirect whole page, this can be set up in CMSDesk in item's Properties / Menu / Menu action - URL redirection. However this redirects whole browser to the specified target url.
If you want to set the source url of some iframe (I suppose you mean this with "content pane"), you could use the Menu action - "Javascript command"
Many articles over internet articles or forums describe updating of iframe source url, e.g.
Loading new documents into iframes.
If your iframe has ID="myFrame", the command - using the frames array method - could look like:
window.frames["myFrame"].location = "http://www.google.com";
Hope this helps.
Best regards,
Zdenek C.