Lost DC, How to change if cant login to admin portal?

Lost DC, How to change if cant login to admin portal?

I lost the domain controller that must have been specified in the config of ADSelService.  Now no users can authenticate to the application and I cannot access the admin portal to change the domain settings.  How do I make the DC setting change to point to another DC?
                New to ADManager Plus?

                  New to ADSelfService Plus?