To change any of your personal details, start by logging into your online account with your email address and chosen password.Click 'My Details' in the menu at the top of your dashboard, and here you'll be able to change any of the following:your first or last nameyour mobile number or email addressyour passwordyour card detailsyour default delivery addressMake sure you click 'Update' when you're done and you'll be good to go.