Your billing information is located in the Client Area, and this tutorial will teach you how to update all your necessary billing details. This tutorial will assume that you are already logged into Client Area. If you are having problems doing that, or don't know how, please view the tutorial named "How to Login to the Client Area".
In the Client Area menu bar, select your name (Hello, <name>) to see a list of choices. Select "Account Details" to update your information correctly.
You now know how to update your billing information in the Client Area of Client Area.