If you signed up online:
Manage your subscription by logging in to SmithsonianEarthTV.com and going to the Account page.
If you signed up through the Smithsonian Earth app on Apple TV®, iPhone®, iPad®, Roku®, Amazon Fire TV® or Amazon Fire tablet:
Manage your subscription through the Apple iTunes®, Roku® or Amazon® account that was used when you first signed up.
If you signed up for Smithsonian Earth through Amazon Video Add-on Subscription:
Go to “Your Video Subscriptions” under your account on the Amazon website.