FOR iOS USERS:

To cancel your subscription on iOS, here are detailed instructions on how to change or cancel a subscription yourself in iTunes:
https://support.apple.com/en-us/HT202039

If you are unable to change or cancel your subscription, please contact Apple support:
https://getsupport.apple.com/

FOR ANDROID USERS:

To cancel your subscription on Android, please visit this link:
https://support.google.com/googleplay/answer/7018481

If you are unable to cancel your subscription yourself or if Google Play is unable to assist you, please contact Episode Support using the chat button and provide the GPA order number or a screenshot of your subscription purchase receipt. 

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See also: How Do I Get A Refund?