To make a PDF document from WhizFolders, you just need to install one of those pdf print drivers and print your document to it. For example, you can try CutePDF or ClickBook drivers–just search google and you will find them. Once you install such a driver, it becomes another printer on your system. To make a pdf document from your notes, all you need to do is print to that printer from WhizFolders. The only limitation of this method is that the links between notes do not work. Other than that, this method works very well.
I used ClickBook for making the User Guide that you can get from the downloads section.
The only drawback is that the internal topic links do not work in the exported PDF. But they can be identified as links by the underlined text. And your reader can find the target headings if you take care to show proper text as links.