Amazon Fire TV - How do I manage or cancel my subscription?

Since you subscribed via the seller's Amazon Channel, you will need to manually adjust or cancel your subscription in your Amazon account. See Amazon's instructions on how to do so here: https://www.amazon.com/gp/help/customer/display.html?nodeId=GDT2SXJJ7K49JKYE

Note: We are not able to cancel this Amazon subscription for you. You will need to do it from your end manually.