To implement the "login" and "register" function on your website. When a new user makes an order, a new account/username and a temporary password will be created automatically after order confirmation. User's personal details will be saved in database under the created account/username. Once logged on, on "my account" page, a user can change password and edit personal details. Once logged on, user's registered name should be displayed at a proper location on the pages accordingly. When a logged on user makes an order, the shipping details in the checkout form can be auto-filled directly with the information collected on "my account" page. The details should be editable.