Adding Video Transitions to Preroll or Postroll
Once you add a Preroll or Postroll to your video, you can then add video and audio transitions to it. When the Edit Clip mode is active, use the Add Video Transition icon on the Editing toolbar.
To add video transitions:
1. 
Click the Add Video Transition icon in the Editing toolbar, select Fade out/in.
The icon changes to indicate that a video transition has been added to the pre or post roll.
2. 
(Option) To edit the video transition, click the icon again.
3. (Option) If you want to change the duration of how long the video transition fades in or out, type the time in seconds in the Duration text box.
4. (Option) To change the color, use the color box to locate the color you want, and click the Choose button to select it, or type in the number of the color in (#000 format) in the appropriate text box.
5. (Option) To delete the video transition, click the Delete button.
