Cloud plan subscriptions (excluding FLEETA users) are managed through your account on either the App Store or Google Play Store on your device. To cancel your subscription, this will need to be done through the respective channel - this cannot be done via the BlackVue app.
For iPhone users, please see the following Apple Support link: View or cancel app subscriptions on iPhone
For Android users, please see the following Google Support link: Cancel, pause, or change a subscription on Google Play
To cancel a BlackVue FLEETA subscription, this can be done either in your PayPal account or on the FLEETA Cloud website (https://app.fleeta.io/) on the Payments & Subscriptions page.