This is how to manually add an RSS feed to many popular podcast listening apps:
iTunes (Mac & Windows)
Click on “File” in the top left menu. Then select “Subscribe to Podcast…” from the dropdown and paste the feed URL. Click ok.
Podcasts App (iOS)
Tap the “My Podcasts” button on the bottom row of icons. Then hit the + button in the top left corner, and select “Add Podcast” from the pop up. Then you paste in the feed URL and hit subscribe.
Paste the URL of the feed into the search field and hit search.
Tap the + button in the top right like you normally would to add a podcast. Then tap “Add URL” in the top right, paste the feed URL and hit done.
Podcast Addict (Android)
Tap the + sign in the top right. Then choose”Add RSS Feed” and paste in the URL of the RSS feed. Tap “Add.”
Tap “Add” on the bottom bar, press “Add Podcast Manually” and in the “Feed” field paste the URL of the RSS feed. Then hit “Subscribe” in the top right.
Podcast apps that do not support manual RSS
Currently, it is not possible to manually add an RSS feed to Google Play Music, Spotify or iHeartRadio.