Crackle is a free streaming service in the US and US territories, so there is no need to de-activate your account. If you would still like to deactivate your account, just log-in to Crackle on your computer, select Settings page under My Account on the top right. From there select the “Delete My Account” option in the “Account” section.
If you are currently located outside the United States, another way to deactivate your account would be to submit a Data Deletion Request securely using the form here: https://submit-irm.trustarc.com/services/validation/cbd5cf83-3a1c-4acb-87b2-be78f55b7215