the help docs for each extension are available through the Help Menu in Dreamweave. Go to Help -> WebAssist
The online versions are also available on the support page for each product.
For Form builder, go to:
css-form-builder/
the help doc is linked at the top in the sentence "CSS Form Builder includes a full online help system"
the same online help link is available on each products support page
to access all support resources, start here:
support/