You can manage or cancel your subscriptions from the Amazon Underground app or Amazon Website or store.
Launch the Amazon Underground app, then open the menu item :
Select the Amazon Appstore menu item
Then choose Manage Subscriptions
This will show you a list of your current subscriptions. Tap the one you wish to remove, and select 'cancel', then confirm your choice,
You can also manage via the Amazon Website, or directly from your Fire tablet if you have one.
|Amazon Underground app for Android||
Note: If you turn off auto-renewal for a subscription, you'll continue to have access until your current subscription period expires.