How to configure test instance in svcutil.exe for soap based apis?

Question

To test this service, you will need to create a client and use it to call the service. You can do this using the svcutil.exe tool from the command line with the following syntax:

svcutil.exe http://testdomain.svc?wsdl

This will generate a configuration file and a code file that contains the client class. Add the two files to your client application and use the generated client class to call the Service

I didnt understood how to configure the Instance.