Cancellation Process -
Google Play
Your subscription is handled by the Google Play store (where you purchased your subscription). So, you can cancel your FabuLingua subscription anytime through the "Settings" on your device (not through the FabuLingua app).
Here are the steps:
Open your device "Settings".
Tap your name.
Tap Subscriptions.
Tap the subscription that you want to manage.
Tap Cancel Subscription.
If FabuLingua's app does not come up on your list of subscriptions, then that means that you do not have a subscription to FabuLingua and are currently using the free version.