how do i cancel a subscription

First I would try going into your browser on laptop and look for emails with from the company you have the subscription with. They will usually have a number or link to their website where you can cancel through website or by contacting them. If you have tried this already or it is difficult to find then you may contact your bank associated with the subscription and tell them you want to do a stop payment with your bank.

There is an Apple article that explains how to cancel subscriptions. Click on the following link: If you want to cancel a subscription from Apple - Apple Support

If the subscription is billed through Apple, even if from a 3rd party, it needs to be cancelled through Apple.