Your link isn't working. To show a video, past the entire url of the video inside the 'insert embed' tags on the menu when you're writing a post. It's the button two over from the red flash button on the bottom row right next to the blue and white 'V' vimeo button. Once you do that you can adjust the 'size' of the embedded video by matching the screen size numbers to the video you posted. The tag looks like this: [ embed=425,349 ]full youtube url here[ /embed ] with the extra spaces taken out.