Look for a website address on the packaging of the anonymous credit card.

Go to that website address and register the card using a fake name, fake address, fake social security number and hobby phone number if asked. Write down your user name and password for future reference.

Go to the TER website and access CC Bill to pay for your membership. In the information section, use all the fake information like name, address, phone etc that you used to register the card in all fields relevant. Also use the actual card number, expiration date and security code at the back of the card and click SUBMIT.

It should work. CC Bill and most CC processors require a Address Verification Service (AVS) and Zip Code match before approving the transaction via the Internet. It is part of additional security protocol measures for Internet and Card Not Present (CNP) transactions due to heavy fraud.

If you are really paranoid, use an anonymous wireless connection like a hotel or coffee shop where it is really difficult to track down your MAC address for your PC. They can track the ISP and finding the PC with the corresponding MAC address is much tougher.

Another option is to use the "customer use" computers at Internet cafes or business center computers at hotels.

I am an entrepreneur and deal with CC processors all the time and know how these processes work.