If you had signed up for your account via iTunes on your iPhone, iPad, or Apple TV, your subscription information is held with Apple. In order to cancel your subscription, follow these simple steps below.
PLEASE NOTE: Apple also has information on how to cancel subscriptions, available on their website at the link below.
https://support.apple.com/en-us/HT202039
Step 1: Locate the iTunes & App Store inside of the settings on your device.
Step 2: Select your Apple ID name at the top. This should prompt you to View Apple ID. Login with your account. In most cases, this is done via Touch ID or Face ID.
Step 3: Locate the Subscriptions and open this inside of your Apple ID account.
Step 4: Select which subscription service you'd like to cancel and select Cancel Subscription. You'll be prompted to confirm the cancellation.