1. Open the live broadcast software or platform and enter the live broadcast settings page.

2. Find related options such as "Video Settings" or "Play Settings", which can be found in the settings menu of live broadcast software or platform.

3. in video settings or playback settings, select options such as "add video" or "upload video" to select the video file to be played.

4. after the video upload is completed, set the video playback mode, whether to play automatically, circularly and display the control bar.

5. click "ok" or "save" to complete the video playback settings.