First you need to download the app "betternet". the following link will redirect you to the app where you'll be able to download it.
1. Okay, one of the biggest problems that might occur is that on iPhone it might tell you that the app isn’t available in your country. Go to profile settings within the app store and change your region from China to the US and enter any information that they ask for. After that, you should be able to search for BetterNet with no problems.