Doesn’t let me to add my phone # – YYP2P Review

How do I add my phone number after I already made an account using my email? When I go to My, then account information, then my phone, it doesn’t give me the option of changing the country. It is stuck on the country of China and doesn’t let me choose America. Is there a customer service or a manual online?
Review by Pegasus145 on YYP2P.