If you signed up for CBS All Access via iTunes and you would like to cancel your subscription, please do the following:

On your Apple TV 4 & 4K:
  1. Go to Home screen> Settings 
  2. Select Accounts > Manage Subscriptions 
  3. Select CBS All Access Subscription > Cancel Subscription
On your iOS device (iPad or iPhone)
  1. On the Home screen, tap Settings.
  2. Tap App and iTunes Stores.
  3. Tap your Apple ID at the top of the screen, where your email address is located.
  4. Tap View Apple ID. You might need to enter your password.
  5. Under Subscriptions, tap Manage.
  6. Look for the CBS All Access subscription.
  7. Turn off Automatic Renewal (change the switch from green to grey).
On your desktop or laptop
  1. Open iTunes.
  2. If you’re not signed in, sign in with your Apple ID. From the menu bar at the top of your computer screen or at the top of the iTunes window, choose Account > View My Account.
  3. Enter your password, then press the Return or Enter key on your keyboard, or click View Account.
  4. On the Account Information page, scroll to the Settings section. 
  5. To the right of Subscriptions, click Manage.
  6. Look for the CBS All Access subscription
  7. Turn off Automatic Renewal to cancel a subscription. Your subscription will stop at the end of the current billing cycle.