If you have forgotten your password, you can reset it from the 'My Account' screen by clicking ‘Forgotten Password’.
If you choose to reset your password, you will receive an email containing a temporary password. Use this to log in to your account and change your password by clicking on 'Change Details' and then ‘Sign in details’ on the left-hand side of the page. You may need to check your Junk/Spam folder for the password reset email.