I'm probably missing something pretty basic here, but I can't seem to figure it out. I want to display my Help categories module in the left pane and my actual Help module (the one with the actual content) in the Content pane. How do I do that?

Thanks. I deserve a dope slap. After I sent the request and before it was accepted, I tried a simple drag-and-drop, which worked perfectly. As does your solution. Doh!