1. Click/Press a button/key to save a point in the video.
2. Click/Press it again to return to that point.
3. Press and hold a key to play from its cue point.
4. If the video was originally paused, when you release the key, it will pause again
5. If the video was originally playing, it will resume playing
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6. Overwrite a previous cue point by holding [Shift], then pressing the button/key
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7. Use left and right arrow keys for skipping through the left player
8. Use [Z] and [C] for skipping through the right player
Problem: Keyboard controls are not working
Fix: You may have clicked and focused on the YouTube player. Try click on the body of the home page (black background) to enable them again
Problem: Video is not loading
Fix: Check if your URL is correct. If the video still does not play, it may be because YouTube does not allow some videos to be played in an embed