To update your email address, first log into your account at Birchbox.co.uk. You will see a link on your Account and Track my Box page with the heading "Edit your account information and password." Click on this link, and then enter your updated email address.
Click "Save Account", and you’re all set!
Please note that the email address you enter will be the email address you should now use when logging into Birchbox.co.uk - Your password will remain the same.