To unsubscribe or cancel your subscription to Metronaut Premium, follow these steps:
- Open the Settings app on your device
- Tap Your AppleID on top (You may be asked to log in)
- Select "Subscriptions"
- Select the Metronaut subscription
- Tap "Cancel Subscription" to disable it from auto-renewing at the end of the current billing cycle
If you are reading this article on the subscribed iPhone or iPad, clicking here will bring you directly your AppleID Subscriptions (step 4 above):
Also: Check Apple Help Article on the subject.