You can add a new caption point from the Timeline by pressing <A>. The caption hotkey does not work when in the Open Captions pane.
1. In the Task List, select Captions.
2. The Open Captions pane appears. Position the playhead on the Timeline to where you want to begin captioning.
3. Click Add . A caption point appears in the pane next to the text box.
5. Click the Play button in the Preview Window. When you reach a point in the audio playback when you want to insert a new caption point, click the Pause button.
7. Click Add.
10. Click Finished.