Updating your Credit Card information for your active subscription is easy.
First Log in to the Launchpad at https://go.itelescope.net/default.aspx
Next, Locate the drop down menu pictured below and select Update My Details
Once selected, it will take you to your account management page where you can update your address, email address, and update your credit card. You do this by selecting the link pictured below:
Once you click the link, it will bring you to the page below. Just fill in the requested information and you are all set!