How do I cancel monthly subscription to iTunes app

Click here and follow the instructions.

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You are not addressing Apple here. This is a user to user support forum. You need to manage the subscription yourself. See the information in this support document. View, change, or cancel your subscriptions - Apple Support

We are fellow users, we can't cancel any of your subscriptions for you. If you log into the account you should be able to do it yourself : View, change, or cancel your subscriptions - Apple Support