You can add a podcast by clicking on the '+' at the upper right in the author's hub. By clicking on 'search podcast' you'll search in a larger library of podcasts. Enter the title of the concerning podcast and click on it.
The podcast will automatically be added. The title, description and picture of the podcast will be taken over. Moreover, one can now listen to all episodes of this podcast.
You can make the podcast available in the library, but you can also add it to a Learning Playlist. You can make it available in the library by clicking on the sprocket at the upper right. Next up, you click on 'available in the library'.