regarding this article: https://support.upwork.com/hc/en-us/articles/211061278-EU-Value-Added-Tax-VAT-
to change my vat number I should contact with support,
but I'm not able to do it because simply I don't know how to contact Before, there was chat possibility but now I cannot find it.
Changing VAT Number or Location
If you need to change your VAT number in the future, please contact Upwork Customer Support.
If you change the location listed in your account by going to Settings > Contact Info, we will automatically adjust your VAT to correspond with the rates in your new country of residence or stop collecting VAT if you have left the EU.
Support: please contact me or let me know how to open ticket
We'll have one of our team members reach out to you directly via support ticket and assist you further with updating your account information, thank you for reaching out to us.