First of all, you have two valid documents, such as our China's, which are copies of ID card and household registration book. Then fill in an electronic account opening form on the platform website where you want to trade (there must be an account opening process on the website), wait for a reply, exchange US dollars at China Bank after accepting your application, and then wire transfer at the post office according to the designated bank. You can receive the transaction password in the mailbox in a week or so.
But what needs attention is the safety of traders. You can look at the ranking information of He Xun foreign exchange traders, which is more reliable, hehe.
I also wish you success.