The one-line version
In the app, open the Alerts tab, scroll to the bottom and tap Delete my data. It is gone immediately — not queued, not a ticket for someone to action on Monday.
It has to work that way round, and the reason is worth stating. The only thing identifying you is a random ID your phone invented, which nothing ever shows you. So if you emailed us asking to be deleted, we could not find your row — you would have no way to tell us which one was yours, and we would have no way to check. The button knows, because it is running on the phone that made the ID.
For the email alerts from the website, email is the right route, because there we do know your address. Write to hello@kraftstories.com from the address you signed up with, or use the unsubscribe link in any email we have sent you. We action it within 30 days and normally the same day.