I like the new iOS app but it needs some sort or help function.
How do I hide a show (episode or entire season)?
How do I delete certain shows that are on my list?
I assume you're referring to the up next progress view? If so, long press on one of the shows. A menu will display and you can hide the entire show or specific seasons from counting in your progress.
If you're referring to the calendar, you can also long press on a show and hide it from your calendar.