You can view which of your visitors have made Orders though Your Store and can log in to make additional Orders.
To do this, click on the menu tab 'Your Store', then click 'Store Clients'.
Click on an Client ID # at the right to view the Client Details.
This page shows you all the Client information at the top, and the Client's Billing and Shipping Addresses at the bottom.
You can edit an Address by clicking on it.
Click the 'Update' button when you are finished.