the way that security assist login works is:
the user enters the username (or email address) and password, this is passed to the database to look up a record that contains the entered information.
if a record is found, the ID for that record is stored in a session variable.
in the security assist authenticate user behavior, you can set the page that they are redirected to on successful login. if you go to the session tab, you can also set other columns such as First name, last name to save to session variables.
on the success page, you can either use the ID session variable to create a recordset that contains the users specific data and display that, or if you set the login top save other columns to sessions, you can use those sessions to display the users information.