Make sure you are editing your WA_Globals.php file to match with your server settings.
You will have to copy the files from the ContactForm_GMC folder to the same level as the contact form file that you are copying the form code to. If you have not done this, the form include files will not be referenced correctly and thus the form will not work.
I did read the read_me.htm page and followed the steps. I've followed the documentation as well as I could through a number of different documents and PDFs. I've seen no mention at all of customizing a form if I'm not using a DW template. Is no help is available on this topic? Surely everybody doesn't use Dreamweaver templates?
I do appreciate the answer to my other question, about the correct file hierarchy. But shouldn't a basic piece of information like that be in the documentation?
I'm extremely disappointed in this product and in the available support. The website and marketing material seem to indicate a well-designed, easy-to-use product, but I have not found that to be the case at all. And to wait hours for only half an answer is pretty frustrating.