How do I copy a disk image using disk utility?

I have a copy of my idvd as a disk image, but when I open disk utility to burn it to a disk, I can't drag the destination disk to the destination box. What am I doing wrong?

How to copy previously-burned DVD-R video discs
http://support.apple.com/kb/HT2059
To create an image file, launch Disk Utility and select File: New: Disk Image From Folder. In the window that appears, navigate to the desired folder and then click on Image. Give the image file a name, and click on Save when prompted. That’s it.

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    Launch the Console application in any of the following ways:
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    Click the Clear Display icon in the toolbar. Try the action that you're having trouble with again. Post any messages that appear in the Console window – the text, please, not a screenshot.
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