Follow this guide to change the video which is used in the Autopilot Media player if you've decided to implement this widget on your website:
Login to your Autopilot account and go to the Setup tab
Next click on the Autopilot Player tab
Now choose from the drop-down menu which video you'd like to use. Once you've done that, click the Save and Publish button
You're done! The video you've selected should update on your website within a couple hours.