Add your podcasts to this page:
Note: If you are using Apple Podcasts, it is not possible to grab your OPML file anymore.
Instead, you can use the plist file on your Mac if you have the Podcasts App on your Mac.
Run this command in your Terminal
pbcopy < ~/Library/Containers/com.apple.podcasts/Data/Documents/PodcastsDB.plist
and create a Gist with this XML file in your clipboard. Then follow step #3 above!