If you would like to embed a video in your website, first select which video you would like to use on YouTube. Once you have determined what video you would like to use, click the "share" button under the video, and then the "embed" button as shown below.
Click "more options" to click additional settings you would like to enable. Typically, enabling "show player controls" as shown to the left is the best bet.
Copy and past the iframe code into your html in the location you would like to include the video as shown below. When viewing the webpage, a video player with the settings determined in part 2 should be visible and active.