You should start embedding your video with picking a suitable content. Don't forget that his tutorial explains how to embed a video from YouTube.
For the next step you should click on the share button, which is located under the video.
After that, click on and off of the settings that you would like to have for your video and click the copy button.
Now, open a new file and paste the copied codes into it. Don't forget to save it as a HTML file.
Open the HTML file that you have saved and there you can see your embedded video.