While you are not logged in, the 'Customer' menu will only display the 'Login' link. Clicking this link will take you to the 'Login/Registration' page where you can login (if you are a registered customer) or register.
After you have logged in, the 'Customer' menu will display links to help you manage your account. These are listed below with brief explanations:
Personal Details
Use this link to check and/or update the information you entered at registration.
Delivery Addresses
Use this link to create and maintain delivery addresses. When you checkout, you can select one of these addresses to have the order delivered to.
Order Information
Use this link to check the status of your order and to view or print an order. You can also cancel an order if it has not yet been processed.
Log Out
Use this link when you have finished shopping.
Administration
This link is displayed for store administrators only. It is used to access the administration section of the store.