Online Documentation for SQL Administrator for SQL Server
Setting database role properties
Use the Properties tab of Role Editor to create/edit a role and specify its properties and membership.
Name
Enter a name for the new role, or view the name of the role being edited.
Owner
Select a database owner from the drop-down list.
Members of the role
Add members to the role, i.e. add the users (or other roles) that will inherit the permissions of the role.
To add a user, you need to move it from the Available Principals list to the Selected Principals list. Use the buttons or drag-and-drop operations to move the users from one list to another.