Press 1 the button of repeating play.

Set the first section of repeat play by pressing 2 the auto repeat start button(left) at the bottom while the video is playing.

Set the last section of repeat play pressing 3 the auto repeat finish button(right) at the bottom.

If you set it, the video will repeatedly play this certain section, and the section express on the top of the screen.
*  If you press 1 the button of repeating play, this function will be turned off.