How do I set up a user management system using CuteNews or phpBB?

Can anyone help me out with creating a user management system using the already existing CuteNews or phpBB forum databases.

I want to restrict visitors from seeing certain pages unless they are users (logged in users) of the cutenews or phpBB set ups.

I’m looking for something minor that just deals with php code really. Nothing delving into mysql database creation or anything like that.

Thanks.