Cancelling your QuickBooks account that was created accidentally is simple, @yan7. I will show you the detailed information below.

The steps to revoke your subscription will depend on where you signed up. For example, if you got it through a mobile app store, you need to return to the app store and cancel your account. If you purchased it directly from Intuit, you can follow the steps below: 

1. Sign in to the Intuit Account Manager.
2. Find Products & Billing, then select your company name. This will take you to your subscription page.
3. Locate the product you wish to cancel, then choose Cancel.
   
4. Follow the on-screen steps. After your cancellation is successful, you’ll get a confirmation.
    

Check out this article for the other ways to revoke your subscription: Cancel your subscription.

I am always available whenever you need additional assistance in managing your account, especially when we talk about cancellation. Have a good day.