Need to unsubscribe from acorn tv
When I try to unsubscribe from acorn tv, within acorn tv it says I got it through ITunes, so when I go to settings on my IPhone there is not a choice for iTunes and App Store, and when I go to subscriptions that is under Apple ID acorn tv is not listed. How do I get to iTunes and App Store if it is not a choice in my settings? If I can’t use iTunes and App Store what else can I do?
iPhone 4s, iOS 9