Let's select first the Account and Settings, Lmr0816.

We can locate the Billing and Subscription tab in the Account and Settings page. From there, we can cancel your subscription.

Let's also make sure that you have an access with the subscription details. Only the company admin and the master admin can cancel it. Check this article about user types in QuickBooks Online.

There are troubleshooting steps we can perform if you have an access but still unable to see the Billing and Subscription tab. The first one is to open an incognito window and try to cancel it from there. Another way is to clear the cache. These are junk files that can cause browser errors. I'd also suggest cancelling it using another browser if this behavior persists. 

Post anytime if you have more concerns. I'm here to help.