How to setup different privilege to users?

In my Nagios server has 3 users, I want setup different privilege to them, the first user can watch all servers(Nagios agent), and receive the alert message for all servers, and other 2 users can only watch some but not all servers and these messages, how to setup the user’s privilege?

Anybody who can see info for a service can use all administrative functions on it. How it’s done i’m not sure anymore, but i think in the docs there’s a small part about having multiple users viewing different objects.

Where’s it?

nagios.sourceforge.net/docs/3_0/cgiauth.html

Very Thanks.