Log in to your account > scroll to the course you wish to watch and click Learn More > click Start Learning > view the course

Click the '▶' button in the middle of the video to play or pause the video.

You can also drag the progress bar at the bottom or click on the time markers on the right side of the screen to navigate through the video.

Click on the gear icon to adjust the following options,

including playback speed, subtitles and quality.

In the upper right corner of the screen, click on 'Dark/Light' to switch.