In the app, you can add / change your personal details such as your mobile number in the Profile screen. Simply go to the main menu and tap on your email address to get to this screen.
If you need to change your email address, submit a request at: https://support.westfield.com.au/hc/en-us/requests/new, and include the current email address used, as well as the email address you wish to use to manage your account. We will also require you to send us an email from your new email address.
We will email you when your request has been completed. Once you hear from us, sign into the app with your new email address and you'll see all your details.