Can I change my game location to like China?

Do you mean can you change battlefields and transfer to a battlefield with predominantly players from China? As of right now, once you're placed in a battlefield you cannot transfer out of that field unless you personally message AMS and request for a transfer.

There was a recent update where all Chinese players who were using a 3rd party program to purchase game packs for cheaper prices were force ported to "special battlefields" however.