How do I add the default local admin back in ADSelfService Plus?

How do I add the default local admin back in ADSelfService Plus?

When I first setup ADSelfService Plus, I created super admin accounts and then deleted the default local admin account.

Now I am trying to add multiple domains in ADSelfService Plus but I believe I can only do that in the Default Local Admin Account. 

When I try and add a local Admin back in, the domain field doesn't have a section for local authentication anymore.  How do I get the default local admin account added back into the system so I can add more domains?

                New to ADSelfService Plus?