You’ll need to go into your Apple ID and then manage subscriptions.

This is the only way Apple allows subscriptions to be canceled. 

FYI: Canceling doesn’t provide a full refund. It only stops renewal.
Please talk with Apple for a refund of the remaining time on a subscription.

Here’s a helpful Apple article on it: https://support.apple.com/en-us/HT202039#subscriptions

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