Invitation code issued by the main user is necessary to invite share users.
Make sure that the main user and a new share user can contact each other before proceeding to the next step.
Tap "Menu" and then tap the email address
Tap "Invite share user"
Invitation code is generated
Tap "Create new account"
Tap "For share user"
Enter invitation code generated by the main user
Please read and confirm Terms of Service and Handling of Personal Information, and tap "Agree to terms of service and handling of personal information, and go to next"
Enter email address for registration
Verification code will be sent to this email address
Enter verification code
Enter password and name to register an account
Your account is now registered
Tap "Go To home screen" to start using the app