After you go to the order page, you will click 'order now' which will direct you to the PayPal screen below where you will enter your PayPal account details or your credit card details if you don't have a PayPal account
After you make your payment on PayPal you will see this screen
Make sure that you do not close the browser. Wait until you are redirected to see your PIN Code. If you are not redirected, press on the "click here" link that you see on the PayPal page.
This will take you to the following screen where your HelloChina PIN Code will be displayed
Your PIN Code will also be emailed. Make sure you check your SPAM Inbox as some free email services treat the emails as spam.