After you've uploaded your XML and audio files, then your podcast is, technically speaking, available for anyone to subscribe to. Just like if you had a URL for a web page, you could just type it in to your web browser to get there, you can use iTunes to get to your podcast with just a URL.
In iTunes, go to the Advanced menu, and then choose Subscribe to Podcast. Learn how to publish your own podcast through iTunes with this how-to.
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