In order to access the podcast in iTunes, navigate to your Plus+ dashboard and either copy and paste the RSS feeds into iTunes manually (File>Subscribe to Podcast) or click one of the two buttons with the Apple logo.
You will see this popup in iTunes. This is where you input your username and password. Make sure you click the “Remember password” option as it will keep popping up every time you access the feed if you do not.
Note: You only need to add one of these feeds. One is a high quality feed and the other is standard quality.