In order to change the email address associated with your Kogan.com account, simply click on 'Contact Details' from the Customer Dashboard sidebar or dropdown menu.
If you aren't already signed into your Kogan.com account, you will be prompted to do so.
Once you have signed in, you can edit the email address associated with your account by clicking 'Edit' and then changing the email to your intended email address.
Note that this email address must be valid, as you will be sent an email to verify your email address.