The said subscription will appear as an "App Store subscription" on the account settings page of the account. 

Note that for those subscriptions deleting the account will not cancel the subscription on Apple side. 

To cancel a subscription please follow the steps described on the Apple website : Manage Subscription.

If you did not cancel the subscription before the end of the Trial or renewal, you need to contact Apple to request a refund:

How to request a refund on Apple