Please click "Complete and Continue" on the top right corner after every lesson to progress through the course. You cannot jump lessons. You can, however, review again past lessons freely.
You may activate English, Spanish or Russian subtitles by clicking the "CC" icon on the right of the video progress bar. You can also click the full-screen icon to better experience the video. On the settings icon, you may also increase or decrease playback speed and adjust video quality (if you have a faulty Internet).