Please see the comment to your question.
The FTP urls are just used for FTP communication, the communication where you share files over the network. To access the WCF from HTTP, you need an endpoint where you can perform an HTTP communication, or other communication based on the protocols that are supported by WCF.
To know which protocols are supported, have a look at the following links,
what are the protocols supported in WCF? | The ASP.NET Forums[
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c# - Which protocols are there, that can be used with WCF? - Stack Overflow[
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Configuring System-Provided Bindings[
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Then finally, it is under the GoDaddy control panel where you can access the details about endpoints of your WCF application. You need to then access the service from that URL. IF you are new to this, you should read the following links to learn more on this topic,
Hosting a WCF Service on GoDaddy[
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Customize IIS settings | Web & Classic Hosting - GoDaddy Help PK[
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These links will guide you setup the bindings that are required by your application in order to actually run the WCF service on GoDaddy and to be able to communicate over the network.