You can cancel your subscription by going to the My Account section. Simply tap the three lines at the top right corner of your profile, scroll to the bottom to view your active subscriptions, then click the three dots next to the subscription you wish to manage. From there, select Manage Subscription, tap the three dots again, and choose Cancel Subscription.
Note: Once a subscription is purchased, refunds are not available. However, you may cancel at any time, and your current subscription will remain active until the end of the billing period.