Your country has already been updated to Serbia. Kindly update your address in the Address section of your Contract Info page (Settings > Contact Info).
when creating my profile, the address section doesn't allow me to change the country, and by default it is United States. If I put any random address, then I was asked to provide an U.S. phone number for verification.
Upwork doesnot all anyone from China for regestration?
We do allow users from China to sign up on Upwork, your country was updated to China. Feel free to update the rest of your address when you`re ready. Thank you.