Sometimes you've published an episode, but realize you need to make a final tweak or edit. To get back to the editing experience, you'll have to unpublish the episode.
Steps:
Visit the Podcast
Click on the Episode that you want to Unpublish
Click the "..." menu in the top right corner
Click the "Edit Info" option
Click the "Unpublish" button
Then you'll be taken to the editing screen to make your edits and publish again.