Can anyone give me info or the sites on forms6i security?

I am using Oracle9i and forms6i.
I have created some users accounts, roles and object privileges granted using Oracle Enterprise Manager and object privileges granted but need to apply it on forms (block level, items level...so Some users can view and edit and some users can view only.

All users are front end users (working with forms only).

Can someone point me to the right way plz.
Thank you in advance.