You can create the new operator record by running the AddNewOperator OOTB activity.
You can use the SnapStart URL ("/prweb/PRServlet/?UserIdentifier=<username>&Password=<Base64encodedPassword>&pyActivity=pyMobileSnapStart&Action=runActivity&pzActivity=Data-Admin-Operator-ID.AddNewOperator") in the Web-login HTML rule onclick of signup button by passing the userid and password in the URL.
The activity AddNewOperator then uses HTML stream to display the New Operator form, which in turn submits to another activity to validate and create the operator instance.
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