Use the link to choose between deactivation or deletion. Neat.
However, if this seems problematic, especially when begin a paying member, read this part of their site:
To cancel this agreement, mail or deliver a signed and dated notice, or send a telegram which states that you, the buyer, are canceling this agreement, or words of similar effect. This notice shall be sent to: Various, Inc. , Customer Service-Cancellations, 220 Humboldt Ct., Sunnyvale CA 94089.