I'm here to ensure you can cancel your trial subscription, @miltoneduardo198.
First, you must be the Master Admin of the company to cancel your account. You can refer to the steps below:
Sign in to QuickBooks Online.
Go to the Settings.
Select Account and Settings.
Click the Billing & Subscription tab
In the QuickBooks section, click the Cancel trial link or Cancel subscription.
Select Continue to cancel.
Follow the on-screen steps until the cancellation is confirmed. You may also consider answering our short survey about your cancellation request. I've added some screenshots for your reference:
Take note that you'll have read-only access for 90 days if you cancel QuickBooks Online (QBO). To know more details about this, you can check out this article for additional information: Cancel your subscription.
I'll be here if you have other questions about QuickBooks. You are always welcome to tag my name in the comment section. Take care.