If you subscribed directly through Peacock, just log in on their website, go to your profile → “Plans & Payments,” and click “Cancel Plan,” then confirm it takes less than a minute. If you signed up through something like Google Play, Apple, or your TV provider, you’ll need to cancel it from that service instead (Peacock won’t show the cancel option in that case). I canceled mine once, and it stayed active until the billing cycle ended, so you won’t lose access immediately.