Help:How to change the country of steinberg account

When I registered my account on the steinberg website, I was mistaken for the country.
At that time, I chose Japan, but I could not find a way to change the country on the steinberg website.

I tried to enter “My Support” page from account page, but I cannot submit the ticket with some messages.
The message as follows:
First of all, we ask you to agree to share your personal information between Steinberg and Yamaha Music Japan in ‘Information sharing with import / seller’ in ‘Account information’.

Please help me, how do I modify the country of my steinberg account,or tell me the email address of steinberg customer service.
Thanks very much!