You can move your self-hosted podcast to Omny Studio without losing your existing subscribers. You will need to tell iTunes, other podcast directories and podcast apps to pull from your new RSS feeds.
The first thing to do is to import your existing podcast into your Omny Studio account. You may have already done this when you set up the account, but if not, just open up a playlist and click "Import a Podcast".
Omny Studio generates RSS feeds for every playlist. Find the RSS feed URL in the “Details” tab of your playlist.
1. Import your podcast to Omny Studio
2. Open a text or code editor to modify your existing self-hosted RSS XML feed
3. Insert the following code snippet under the <channel> node
<itunes:new-feed-url>paste your Omny Studio RSS feed</itunes:new-feed-url>
4. Your resulting RSS XML file should be
<?xml version="1.0" encoding="UTF-8"?>
<rss xmlns:itunes="http://www.itunes.com/dtds/podcast-1.0.dtd" version="2.0">
<title>All About Everything</title>
Note: Although iTunes will normally pick up on changes within a few days, you should leave the old feed in place for a few weeks to ensure all subscribers are moved across.
If you are technically savvy, you may also want to consider setting up a HTTP 301 redirect for your RSS XML file to the Omny Studio RSS feed URL. Not all podcast apps recognise the <itunes:new-feed-url> tag, so redirecting the feed in this way as well will ensure you catch all subscribers.