Important Notice:
This is the Chinese version of the game and the shop is NOT responsible for regional, language or any other upcoming restrictions!
Buy this product only if you understand the risk at your own responsibility! Chinese IP address is required to activate the key on Steam! Use a Chinese VPN to do so. (Quick & Easy Instructions here) Once the game is activated you can log in and play from anywhere.

Go to: http://store.steampowered.com/ and download STEAM client.
Click "Install Steam" (from the upper right corner)
Install and start application, login with your Account name and Password (create one if you don't have).
 Please follow these instructions to activate a new retail purchase on Steam:

Launch Steam and log into your Steam account.
Click the Games Menu.
Choose Activate a Product on Steam...
Follow the onscreen instructions to complete the process.