I went to the FAQ and found the following instructions:
"If you wish to disable auto-renewal, log in to your account via our website, click your username in the upper right corner of the screen, select ‘Account’, and click the ‘Disable auto-renewal’ button."
However, I can't seem to find the "Disable auto-renewal" button? And, after looking at screenshots included on the same FAQ page I've noticed that the button is there, but not present in the same place on my own account page?
Here's a screenshot:
http://i.imgur.com/dAsLz56.png
Please let me know how to disable auto-renewal, thank you!