Rather than deleting it as a whole, I'm pretty sure you can just cancel the subscription.
First, try to go through the subscription page and find an option to cancel it.
If that doesn't work, go through your payment method and cancel your subscription through there.
If you've only made the account, your 8 day trial is completely free and it will not charge you but instead request that you start a subscription. If that happens, then just decline the subscription.
