Only you can manage and cancel subscriptions.
Go to your device's Settings, then
- Scroll down and tap iTunes & App Store
- Tap your Apple ID
- Tap View Apple ID
- Tap Subscriptions
- Tap Pixel Art
- Tap Cancel subscription
- More information can be found here: https://support.apple.com/en-us/HT202039
Please note, you can continue using our free version after cancelling subscription.
If you don’t find Subscriptions point on your account page, that means you don’t have any subscriptions.