Watch Live Video - Use the video player controls top right to expand the video to full screen or get hot keys. You can rewind the "live" scrollbar to review past 1 hour of current stream (useful to replay highlights). Use the arrow keys to go back 10, 30, 60 seconds and try the slo-mo feature as well.
Watch Video Replay - Click the "Video Replay" link in the top right to open the side drawer and select the date from the calendar. Use the time scrollbar to find your game.
Create a Clip (save highlights)- When viewing replays, click the "Create A Video Clip" link below the video screen. Click "Begin Time" to start clip and "End Time" to finish. Then click "Preview" link to preview the video. Click green "Save clip to YourGameCam" and follow prompts to save the highlight clip to your YourGameCam account.