The instructions for "Preparing CD or DVD Media" on Mac OS X are either out of date (referring to an 
earlier version of OS X) or simply incorrect. See Section 4.1 here:

http://fedora.redhat.com/docs/install-guide/fc6/en/ch-preparing-media.html

First, there is no "Disk Copy" utility in OS X. I believe the author is referring to to the "Disk Utility" utility.

Also, the menu is called "Images" not "Image". And there is no "Burn Image" command. There is a "Burn" 
command, but it is grayed out by default.

Here is an example of correct instructions on how to burn an ISO. They have been tested on Mac OS X 
10.4 (Tiger):

1. Insert a blank disc.
2. Start Disk Utility.
3. From the File menu, choose Open Disk Image and select the ISO to be burned.
4. In the list of volumes, you will now see an item representing the ISO file. Select it.
5. Click the Burn button and follow the instructions.