I want to cancel the service

Thanks for posting to the Community, @van-hongvan.

It saddens me to see you go. To cancel the service in QuickBooks, you can follow these steps using a web browser:

1. Sign in to QuickBooks Self-Employed.
2. Go to Settings ⚙ beside the help icon.
3. Select Billing Info, then Cancel subscription.

If you're using your mobile when you purchase QuickBooks Self-Employed, you can refer to this article: Cancel your QuickBooks Self-Employed subscription.

Also, you can contact our QuickBooks Self-Employed Care Support team to cancel the service.

Just in case you wanted to reactivate your subscription, I'll add this article as your reference: How to resubscribe to QuickBooks Self-Employed.

I'll be happy to see your feedback or comment if you need my assistance. I'll keep my notifications open. Have a good one and take care!