I have problems connection to Soap with Authentication

Question

i'm trying to connect my project to SoapUI with an authentication. I am connected to my WS but after reading lots of documents I can´t understand how to connect to my Soap, with my authentication.

What i am trying to do is to send a value to the Soap, and then receive parameters from it. I have my WS connected, so what I am trying to do is to send the username, password and url to the Soap, and after that, send my parameters values to recover the ones that Soap returned.

ZWsCustomerInvoiceGetList zwCustomer = new ZWsCustomerInvoiceGetList();
ZfacturaMat zfacturaMats = new ZfacturaMat();
ZinvoiceList zinvoice = new ZinvoiceList();
zwsCustomerInvoiceGetList.Credentials = new NetworkCredential(userN, _pasw, _url);
var client = zwsCustomerInvoiceGetList.Credentials;

result = new SoapClient(cliente);

This is the line that I have problems

result = new SoapClient(client); 

I'm new with this connections, I have never used Soap before.

If you guys need something else i'm open to give it to you.