Here are sources to download an ISO burner - needed to burn Linux ISO image to a DVD (such as the Yellow Dog Linux download from Torrent).
http://www.cdburnerxp.se/download.php
http://www.imgburn.com/
I recommend the first one above (CDBurner XP). Install it, and then open the program. The main window will open up with small window in the center, and three choices in it. Choose the first one.
In the toolbar at top, select File, and then select "Write Disk from ISO File" in the drop down menu.
A smaller window opens with a button at top to click on and choose the location of the ISO that you want to write to a DVD.
There are other choices, like speed to write disk at, just leave them at default or you can choose lower speed (1.0x is best) to ensure it gets written perfectly if you have an older Burner.