I would like to cancel some of my chanels

Nice to meet you, *****!
Could you please tell me, what service you are using to watch these channels?

Got it
Press the Home button on your Roku remote.
Use the directional pad to navigate the channel grid and highlight the partner subscription channel, or The Roku Channel. The directional pad is plus-shaped and is in the center of your Roku remote.
Press the Star button on your remote to open the options menu for the desired channel. Partner subscription channel: Select Manage subscription to view the renewal date and access additional options. The Roku Channel: Select Manage subscriptions to see a list of all Premium Subscriptions on The Roku Channel. Select the individual partner subscription to view the renewal date and access additional options.
To unsubscribe, select Cancel subscription. A message appears telling you how long you can continue to access the content and services.
Confirm by selecting Cancel subscription. A new message appears confirming the cancellation, along with a reminder of the date when you will no longer have access to the subscription.
Select Done.
Repeat steps 2-6 for additional subscriptions you wish to manage.
Alternatively, you can go to my.roku.com on your computer or smartphone.
If prompted, sign into your Roku account. If you have trouble logging in, learn how to recover your login details.
Scroll down and select Manage your subscriptions.
Locate the channel under Active Subscriptions and select Cancel subscription.

Great job, *****!
Is there anything else I can do for you today?