To add a video to the site is a two step-process.
1. Upload your video to YouTube
2. When YouTube completes the processing, copy the URL of the video
1. Login to your website
2. Click on Add Content in the administration menu at the top of the page
3. Click on Video (from the add content page)
4. Fill in the blanks, using the copied URL of the YouTube video for the video field
5. Click save.