You can follow these steps to cancel your subscription:
For Android users:
1. Launch Google Play Store
2. Go to Menu -> My Account -> Payments&Subscriptions
3. Select the subscription you'd like to cancel
For iOS users:
1. Launch App Store
2. Tap the account icon in the upper right corner -> Subscriptions
3. Select the subscription you'd like to cancel
Note:
1. If you would like to cancel the subscription, please do so at least 24 hrs prior to the end of the current period.
2. After you cancel your subscription, it will be unavailable in the next period. While the charges of this period cannot be refunded as the current subscription will be available until the end of this period.