Go to Youtube and find the movie you want to embed

Click on Share

carmvoie.PNG

Click on Embed

embed.PNG

Change the Video Size

Deselect 'Show suggested videos when the video finish' if it is ticked

Copy the embed code

embed again.PNG

Go back to Wiki, click where you want the video to be on your page

Click on the Widgets button widget.PNG

Click on Other at the bottom of the screen

Screen Shot 2014-03-30 at 4.26.46 pm.png

Click in the empty box and then paste the code

Click Save

The movie will appear on the page

Click Save again

Screen Shot 2014-03-30 at 4.27.06 pm.png

If you are putting several movies on a page, it is a good idea to insert a Table first and then insert each widget into a different cell.