I need help cancelling a subscription.

See the instructions in How to cancel a subscription from Apple - Apple Support including the following:

If you don’t see Cancel, the subscription is already canceled and won't renew.

and

If you cancel a paid subscription, you can keep using the subscription until the next billing date.

If necessary, also see: If the subscription that you want to cancel is not listed - Apple Support including the following:

If you still can't find the subscription and cancel it, contact Apple Support.

If you purchased the subscription from the Apple Store, you can check out the link here on How to cancel a subscription from Apple.