I just did it through the online chat. Go go customer service and click "live chat" in the lower left-hand corner. Select "billing questions" from the list and enter your information.
You will be placed in a queue and all you need to do when the representative comes online is type "I would like to sign up for Cinemax for 12 months for a penny" and you will get signed up until January 31, 2010.
I already had autopay with paperless billing feature as part of DVR HOme Advantage.
Transcript of agreement is:
"To be eligible to receive Cinemax for the next 12 months for just a penny you have agreed to sign up for AutoPay with Paperless Billing. You will continue to receive Cinemax for 12 months for a penny until January 31, 2010 as long as you keep AutoPay with Paperless Billing. If you remove AutoPay with Paperless Billing you must call within 30 days to remove Cinemax from your account to avoid the $5 downgrade fee and to avoid paying normal price for Cinemax programming. Annual Cinemax for a penny does not package with other premium channels, such as HBO, Showtime, or Starz."