Find a video you'd like to place on your site on youtube, or you can upload your own video to youtube.
When you're viewing the video, look below the video and find the share button. Click on this button to view more options.

When you click the Share button, the HTML code used to embed a link that video is displayed directly below it, however that's not what we are after--we want to directly embed the video into the page. We do that by clicking the Embed button which is displayed directly below the Link URL, as shown below.

Copy this link and paste it into the info page or mainpage editor, where ever you would like the video to appear on your site.
