You can redeem it via the link below.
https://calec.china-airlines.com/JCD...y=tw&locale=zh
Requirements:
1. Business Class on board 777/350 between Europe, North America and Sydney for flights between December 1, 2017 to February 28, 2018.
2. Ticket must be issued on 297 stock and not code shared. Flight no. starting from 7, 8, or 9 is ineligible.
3. Infant ineligible.
4. 1x 24 hour wifi pass per applicable sector.
5. Wifi pass expires on October 19, 2019.
6. Wifi pass must be redeemed prior to flight boarding.
7. Applicable to DFF members only.