Short answer
You can manage your subscription in the app.
Steps
Open the app.
Go to Settings.
Tap Manage Subscription.
From this screen you may be able to:
cancel the subscription / turn off auto-renew;
edit your payment method;
remove a saved payment card when available;
view invoice history.
Important
Some options, such as removing a saved payment card, may only be available after the current subscription period expires.
Canceling auto-renew prevents future renewals. It does not automatically refund the current billing period.