The security section enables access to both users and roles. Here you can setup new and amend existing users and assign their permissions through the use of roles.
 

To	See
Add a new user record	How to: Add a user
Assign a role to an existing users	How to: Assign a user to a role
View functionality that a role provides	How to: View permissions granted by a role
View which users are in a role	How to: View which users are in a role