How Do I cancel Avast!?

I have had Avast! for a few years now. But I recently received free software with a computer that has a 3 year license, so I figured to cancel my account on Avast rather than repay every year for 3 years.

Unfortunately I log in and cannot find a way to cancel my auto-renewal. I click on Licenses and it clearly states they are set to auto-renew, but will not let me edit anything. I cannot even change it to a credit card that has expired.

Disabling Automatic Renewal service for Avast orders distributed by Nexway
https://www.avast.com/en-us/faq.php?article=AVKB136#artTitle

Disabling Automatic Renewal service for Avast orders distributed by Digital River
https://www.avast.com/en-us/faq.php?article=AVKB126#artTitle

Access help on this topic within the Avast User Interface:
https://forum.avast.com/index.php?topic=165749.msg1181311#msg1181311

Ihave contacted my credit card company asking them not to make anymore payments to Avast