You can find your Podcast feed URL in your Podbean account "Settings"->"Feed/iTunes" page.  Normally,  your podcast feed URL is https://subdomain.podbean.com/feed.xml.  Before you start to use the feed URL, please validate it at http://castfeedvalidator.com. If there are errors on the feed,  please fix them.  Moreover,   please make sure you have published at least one episode before submitting your feed to iTunes.