You can update your billing information right from your Trellus account!
After you log in to your delivery dashboard, click the Menu on the top right and then choose Account Settings
Choose the Edit button in the Payment Info card or if you need to change your billing address choose the Edit button in the Billing Info card.
Please make sure to keep the most up-to-date card on file. If your credit card fails 3 times, your subscription will auto-cancel.