Log in to TUMonline and navigate to the business card of the respective organization. Click in the applications menu at "Roles".
Screenshot: Applications menu - roles
You find a list with all roles and role owners in the organization. By clicking on the name of a person you reach the business card of the person with the contact details.
Screenshot: Organization - list of role owners
To display the rights of the several roles, click top right on "role/application". An overview about the rights opens up.
Screenshot: Display rights of a role