Open the Extras > Define pages editor and choose the More Information page to edit. Choose the editor you want and paste the code for you flash move at the position that you like.
It should look like this one. Feel free to try it when you own code doesnt work. This is a flash move from youtube.
Code:
<object width="425" height="344"><param name="movie" value="http://www.youtube.com/v/oF9YEQUEZl4&hl=en&fs=1&"></param><param name="allowFullScreen" value="true"></param><param name="allowscriptaccess" value="always"></param><embed src="http://www.youtube.com/v/oF9YEQUEZl4&hl=en&fs=1&" type="application/x-shockwave-flash" allowscriptaccess="always" allowfullscreen="true" width="425" height="344"></embed></object>
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