We have a complete Solution Recipe that is dedicated to user level authentication, here is a link to the pdf for it:
securityassist_user_level_auth_sr.pdf
In the solution recipe section on the SecurityAssist support page there is also an interactive version of the Solution Recipe, here is a link to the support page if you need it:
securityassist/
Please review this Solution Recipe to get a feel for how to setup the user level authentication. Let us know if you have any questions or if you encounter any issues.