Human: How to add subtitles to YouTube videos? Assistant: 
Add Subtitles to YouTube Videos
1. Sign into YouTube.com.
2. Go to http://www.youtube.com/my_videos.
3. Click the menu next to the video.
4. Click Subtitles and CC.
5. Click Add new subtitles or CC.
6. Select a language.
7. Play the video.
8. Pause where you want to insert a subtitle.
9. Enter the subtitle and select a length.
10. Click Publish.