All Joy 101 memberships are purchased and managed through your Apple Account (iOS) or Google Play account (Android), depending on your device.
iOS:
To make changes to your subscription, open your iPhone and go to Settings > [your name] > Subscriptions. From there, you can view, update, or cancel your plan anytime.
Android:
Open the Google Play Store, tap your profile icon in the top right corner, then select Payments & subscriptions > Subscriptions. From there, you can view, update, or cancel your plan anytime.