How to use the WCF Service Configuration Editor

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Ctrl + S, save the config.

<?xml version="1.0" encoding="utf-8"?>
<configuration>
    <system.serviceModel>
        <behaviors>
            <serviceBehaviors>
                <behavior name="CalculatorBehavior">
                    <serviceMetadata httpGetEnabled="true" />
                </behavior>
            </serviceBehaviors>
        </behaviors>
        <services>
            <service behaviorConfiguration="CalculatorBehavior" name="Services.CalculatorService">
                <endpoint address="http://localhost:9999/CalculatorService" binding="basicHttpBinding"
                    bindingConfiguration="" contract="Services.ICalculator" />
                <host>
                    <baseAddresses>
                        <add baseAddress="http://localhost:9999/CalculatorService" />
                    </baseAddresses>
                </host>
            </service>
        </services>
    </system.serviceModel>
</configuration>