To cancel a free trial of Peacock Premium, you can follow these steps:

1.Go to the Peacocktv.com/tv website or open the Peacock app on your device.

2.Log in to your Peacock account.

3.Click on your account icon in the top right corner of the screen and select "Account Settings."

4.Under the "Subscription" section, click on the "Cancel Subscription" button.

5.Follow the prompts to confirm your cancellation.

Via   Peacock.com/tv

Note that if you do not cancel your Peacock Premium subscription before the end of the free trial period, your subscription will automatically convert to a paid subscription and you will be charged the applicable fee. Be sure to cancel your subscription if you do not want to continue with a paid subscription.