Installing Chinese in macOS

1. Open System Preferences. Select "Keyboard," then select "Input Sources."
2. Click the "Add" button, select "Chinese, Simplified" (or "Chinese, Traditional"), select "Pinyin - Simplified" (or "Pinyin - Traditional"), then click "Add."
3. Close the System Preferences window.
4. On the desktop, there should be a flag icon in the upper right corner of your screen. Click on the icon to slect your input method. You can now select simplified Chinese or traditional Chinese.

For help with setting additional preferences, please consult this article.