When i need to use Credentials ( like in wsHttpBinding - Connection ) there is no way to set them ( only endpointAdress and enpointConfigurationName are available )..
 
Workaround is sth. like this:
 

        var client = new WcfLogReceiverClient("WSHttpBinding_ILogReceiverServer");
        client.ClientCredentials.UserName.UserName = "demo";
        client.ClientCredentials.UserName.Password = "demo";
        client.ProcessLogMessagesAsync(new NLogEvents());