If your account details have changed you can update your details on your account by clicking My Account > My Settings > My Details. When you have filled out the relevant details you need updating click the orange update button. Essentially by using the "My Account" tab you will be able to navigate to the "My Details" section.
Your address will be auto-populated when selecting the full address from the drop-down menu.
Should you have any questions or feedback, please don't hesitate to contact our Customer Support on 1300 188 911 or at firstname.lastname@example.org