User Roles and Capabilities
bbPress comes built in with user Roles that give the website owner the ability to tailor user access to their website. This page details the bbPress capabilities that each role has.
You manage bbPress users roles in the same way you manage WordPress user roles. (/wp-admin/users.php)
Under the hood details of the roles and capabilities introduced with bbPress 2.2 can be read here.
(bbPress user Roles can be found in /includes/core/capabilities.php)