Follow the below procedure:
On the home page of the console, click Access Control.
In the navigation pane, click User Roles.
In the details pane, select the user role you want to modify and click the edit icon on that row or click on the user role you want to modify. Edit User Role page is displayed on the right pane.
Modify the following fields:
General: Modify the Name and Description of the user role and click Next.
Included Members: Click Add to select users from the dropdown list which should be included in the user role.
The drop down list shows Local Users, Agent Users, LDAP Users and Groups, and Database Users sources.
Browse to the users or groups and select a source. Click Add.
To remove, select existing users or groups from the table and click Remove.
Click Next.
Excluded Members: This field is applicable only for LDAP users and groups.