From the System Roles tab of an application user record, you can assign applicable system roles to the user. When you assign the system roles to a user based on his or her job and responsibilities, the user sees only the tasks and features required to perform his or her specific roles. When you assign a system role to a user, you can also select the record level access for the user within the role.
To add a system role from the application user record, on the System Roles tab, click Add.