This feature is available only on Spotipo Provider Plan
Admin login has full access to Spotipo, they will be able to configure all the options, view all the sites etc.
They can be created from Dashboard -> Manage -> Admins
To create a new admin user, use the New Admin Button and provide all the required details
Please not the Email should be unique across Clients and Admins. If an email is used to create a client, same can't be used as Admin