I think your itunes help section is outdated. Apple changed the look of iTunes so it's different.
I've always hated iTunes but what can I do. I have no choice. Unfortunately, I dislike it because I can't figure anything out without wasting large amounts of time.
So I want to use it to subscribe to the upper intermediate feeds and download all the episodes for a season. However, when I go into iTunes, it's a big mess. All of your content is listed at once and it's sorted by DATE. So it's pretty much impossible to find a particular season and download it without wasting huge amounts of time.
I am bad at iTunes so I could very well be missing something that makes this a lot easier. Which is why I'm posting here. I hope you have some advice.