First, go to Youtube.com. Select a video that you would like to embed.
Next, find the share button located to the like and dislike buttons and click on it.
A menu will appear. In this menu, click on embed, which will take you to another window.
Finally, click the copy button. This will copy the entire line of html code needed to embed the youtube video into your html document. All you need to do from here is click paste in the location wherever you would like the video.