How to cancel a subscription in Apple TV

Hi. I decided trying watching for free because first, I wanted to buy a rented movie, so I clicked it. If it’s okay, I’ll purchase it. But it didn’t work, I went back to my ‘up next’, it still shows the price, so it doesn’t free right? (Is it free just only tv programs not movies?). After that , I tried to cancel in the Apple TV setting but I could not find how to cancel it. I just want to purchase rented movie. Could you help me please? Thank you so much.