Good question, the URL (http://www.comejourney.org/podcast/) is the human podcast archive. It’s made for us to be able to read and click through. For iTunes, it needs an RSS feed that indicates the episodes, the media files and so on that go with each.
In the theme options, there is a section on podcasting. You’ll need to fill in all the fields there for the audio feed and save your changes. Then you’ll need to create a new page for the feed. There is a page template that you use for this feed. Select it and publish the page. The URL to that page is what you’ll want to submit to iTunes for your site. It’s not intended for humans, so don’t add it to the navigation menu. Just give it to Apple instead.
Until just recently Apple did not require that. I released an update to the theme last month that adds an explicit tag to push through validation. If you’ll update the theme, it’ll add it for you. There’s not an option for it as it’s hard coded in the feed.