I'm here to help you out with your concern about canceling a QuickBooks Online (QBO) subscription.
First, ensure you're logged in as an admin user, then also check if you're in the Billing & Subscription tab. Once you're logged in as an admin user, follow these steps:
See this article for more details on this process: Cancel your QuickBooks Online subscription.
In the future, in case you change your mind and reconsider QuickBooks Online for your business, open this article: How to resubscribe or reactivate QuickBooks Online. It has the steps on how you can reactivate your canceled QuickBooks Online subscription.
Direct other concerns you have in the comments below. I'll be sure to take of it.