The Live Chat on the Finland site was really hard for me, it was so easy before but I was able to change it to the end of October via the UK site.
The Finnish Live Chat told me that I have to rebook in the original departure and destination, even thought my ticket has been rebooked in MUC-HKG already for about 2 times. I then asked her, what should I do if I already flown one of the flights and then she replied back that she would have to consult with her supervisor!!! She also said that this policy has been approved by her supervisor and there is no need to escalate the issue to the upper level! She told me to accept the new flights (still MUC-HKG) that have been rebooked for me or get the full refund!!!