how can I cancel a trial subscription of YouTube TV

Do you have the iPhone app for YouTube TV? Did you subscribe using that app and using your normal iTunes Store payment method (yes, I know you signed up for a free trial)?

If so, use the method described in the article I attached.

But whether you subscribed this way or not, you can cancel using a computer's web browser:

https://tv.youtube.com/

View, change, or cancel your subscriptions - Apple Support

Help me please. I already hit cancel my subscription in the correct site but the app for YouTube TV still remains.