Enable Chinese Pinyin Input on MAC OS X

1. Click on Apple icon > System Preferences... > Language & Region

2. Click '+' under Preferred languages:

3. Highlight '简体中文 － Chinese, Simplified' > Add

4. Choose 'Use English' on 'Would you like to use Chinese (Simplified) as your primary language?'

5. Select 'Pinyin - Simplified' > Add Input Source

6. Click Keyboard Preferences...

7. Check 'Show Input menu in menu bar'

To enable keyboard shortcut to switch between input:

8. Click Keyboard Preferences... > Shortcuts > Input Sources

9. Check 'Select the previous input source' > Double click on the current pre-defined shortcuts

10. Hold the 'Command' key + 'N' key > The shortcut key had changed to 'Command'+'N'

URL: http://pinpinchinese.com/blog/how-to-use-pinyin-to-type-chinese-mac/