If you subscribed via the Inbox Zapper website:

1. Click on your profile icon in the top right of the web app.
2. Click “Subscription” in the dropdown menu.
3. This will open a page where you can manage your subscription, including editing payment details and cancelations.

If you subscribed via the Inbox Zapper app:

1. Go to the App Store app on your phone
2. Tap your profile icon in the top right
3. Tap on “Subscriptions”
4. Find your Inbox Zapper subscription in the list of active subscriptions and manage/cancel from there