star alliance how to change the paid date of route (author is Japanese)

If you can booked the route, you can receive the e-mail below,

after click the bottom 

e-ticket number

Your flights are not eligible for online modification. Please contact our call center for more details.

→It says we may not modify the date online so I recommend you contact the staff of the airline company in advance. 

https://www.staralliance.com/JA/faqs?category=4

The web site says we can call the desk or send e-mail
オーストラリア： +61 292 535 888 （国内固定電話）
　ドイツ： +49 69 2999 3222 (国内固定電話)
　日本： +81 368-376-690（国内固定電話）
　アメリカ： +1 866-900-5018 （アメリカ国内通話料無料）

 

staralliance.bookandfly@dlh.d

you may contact each airline you will ride direct by phone
please click the link and search for the number.

https://www.staralliance.com/en/airline-contacts

you can search for the phone number