Hi William,
Actually all of the info is in the KBA...
Create a new WEB SITE by going to New Web Site and select this option:
use the defaults and once the site is generated look in the Solution Explorer and you'll see the folder listed in the KBA:
Edit the RouterConfig.cs file and make the change according to the KBA article.
This is all new to in VS 2013 so upgrading an older WEB app likely is not going to have those folders and the config files. Possibly just adding them may work but you should ask Microsoft how to.
These are being generated by the default Templates they created for VS 2013, we can't modify them so the KBA is how to alter the behaviour.
But we are going to update the KBA and add the example above so it is clearer. Older VS projects will not have that folder or config files.
Don