Cancel a Roku subscription
If you signed up for a Shudder account on Roku, you can cancel your membership by completing the following steps:
Go to https://my.roku.com/subscriptions on your computer or smartphone
If prompted, sign in to your Roku account
When the “My subscriptions” page loads, find Shudder in the list
Select Unsubscribe
Refund Requests: https://support.roku.com/contactus/1