We are looking for a form in your list of forms that a user would establish a "user" and "password" that they would use to "log in" with on the log in form we do see on your list. Is there such a form?
Currently we do not have this functionality. However several users have expressed a strong desire to see this coded as an option into FA forms. I would direct you to: http://beta.formassembly.com/forum/discussion/171/user-management/
I would suggest you discuss with a911driver what your requirements are, so that all those interested parties can form a consensus that we can prepare a proposal for.