Drag the YouTube Channel widget (shown above) onto your tab page.
This will launch the Widget Properties box.
Enter the the name of your YouTube Channel, NOT the URL! If the URL to your YouTube Channel was http://www.youtube.com/FacebookTabsite, you would only enter "Facebook TabSite."
Enter the number of videos you would like to display on your tab. There is also a field to enter an optional Title for your YouTube Channel Feed.
After creating your widgets and settings. Don't forget to click Save.
This window will appear. Just choose Save & Continue to save what you are doing and keep working, or Save and Close, and click Okay for the succeeding windows.
Type your Page Name and click Save.
To learn more about the Container Properties, click HERE!