Here are the steps to cancel a Prime Video Channel subscription on the Prime Video app:
● Open the Prime Video app on your device.
● Navigate to the "My Stuff" tab.
● Select the "Prime Video Channels" option.
● Find the channel you want to cancel and select it to go into the details page.
● Scroll down and select the "Cancel Channel Subscription" button.
● Confirm the cancellation by selecting "Yes, Cancel".
The cancellation will take effect at the end of your current billing cycle. You will continue to have access until then.