If you purchased your Bumper subscription through the iOS app, your subscription is managed by Apple. Apple requires that you cancel your subscription through your Apple account. You can follow these steps to cancel your subscription:

1. On your device, tap open the Settings app.
2. Tap your name.
3. Tap Subscriptions.
4. Tap the active Bumper subscription.
5. Tap Cancel Subscription. You might need to scroll down to find the Cancel Subscription button. If there is no Cancel button or you see an expiration message in red text, the subscription is already canceled.

For more information and screenshots of these steps, please see https://support.apple.com/en-us/HT202039. If you need assistance with this process, please contact Apple.