Wow. I don't think he was trying to annoy, just inform. Since you are asking for help on a rather non-complex matter, maybe he thought your knowledge was limited. No need to be rude. You catch more flies with honey, than with vinegar.
If you followed these steps, then I don't have any further help, but it seems pretty straightforward.
Also check out Burn, it is a free disc burning utility. Haven't used it though, so I can't comment on it, really.
With Toast, you just want to do a disk-to-disk copy. Just select the ISO image as the source disk and your DVD in the burner as the target. I do this all the time with ISO images.
Yea, after I posted it... I realized he meant the guy that created the original iso. I thought at first he was talking about me. Sorry to the original poster.