Add or Remove a Realm

To add a realm, click Add, type the name of the realm (Kerberos realm names are usually uppercase; in a DCE environment, realms or cells are always lowercase) and type the full name of the host that is running the security server (or KDC) for this realm, and then click OK.

-or-

To remove a realm, click Remove, and then when the message appears telling you that removing a realm invalidates any storage using that realm, click OK.