Danae, I may be entirely wrong here, but as I recall, the login e-mail and password for the survey should be the same one given when you registered with the Preeclampsia Foundation Registry, NOT the forums. They are two different things.
If you haven't already registered for the Registry (if that makes sense [:p]), the go ahead and create a new account. If you registered in the past and are still having trouble logging in to the survey, then I would suggest e-mailing Robert, our webmaster, at firstname.lastname@example.org.
Hopefully someone who knows more about this will correct me if I'm wrong!