Can I change ID (e-mail address) ?
Please follow these steps:
1. Open the app's home screen
2. Tap "Settings" on the bottom-right of the screen
3. Tap "Check & Change Registered Details"
4. Tap "Change Daimaru Matsuzakaya ID (E-mail Address)"
5. Enter your new ID (e-mail address) and current password, then send
6. Enter the confirmation code that is sent to your e-mail address