To view and manage your account information, head to your User Settings from the dropdown menu in the upper right corner. Your basic account information will appear on the main setting page, allowing you to update your name, email, and password.
The second heading on the left panel is where your current subscriptions are listed. On that page, you can view your subscription level for each author and, if desired, end your subscription.
If you need to update your payment information, request a refund, or investigate a failed payment, please refer to this article: