@Life1960, you can cancel any subscriptions you have through Roku by logging into your account at https://my.roku.com using the email address that's displayed on your Roku device under Settings->System->About. You should also be able to manage the subscription on the Roku device itself by highlighting the icon for the app on your Home Screen and pressing the * button on your remote.
If the subscription is not through Roku but is directly through the provider, you'll have to go to the provider's website to cancel it.
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