Are you talking about the user registration form that is produced by SecurityAssist? Did you run the SecurityAssist wizard to generate a set of pages?
A registration page should allow a user to register and create a new user in your db. Once the user has been created in the db they should be able to login using the generated login page, or on a page you created yourself that has the Security Assist Authenticate user server behavior on it.
In addition to logging in you must also have access rules defined and applied to your pages to restrict access. By default there is a logged in and not logged in access rule. If you apply the logged in access rule to a page the user must login first to view the page.
Please post back and explain exactly what troubles you are having, the steps you took, and the desired result you are hoping to achieve. With this info we will be better able to help you out.
