form builder confusion

I have just installed Design extender and data bridge to DW CS6.
I want to add a simple form to register a download and add captcha. Add email form details to user and myself.
Ive done all this prior with DW forms and UE4.01
Form Builder so confusing.
I keep getting to chose from preset forms like login and password etc.
I cannot get past these presets.
How do I create a simple form without using the presets. Help tells me I can do it but offers little "how to"
Also
How do I add captcha to an existing form. I tried the insert button but nothing happens.
How do I refresh the captcha code without refreshing the browser, I could do this in the old version
Any video tutorials regarding Form Builder?
Thanks
David