Burn an ISO from Mac OS X

First go to Applications > Utilities > Disk Utility

Then go to Images > Burn and find your ISO.

If you have suggestions or corrections for these tutorials, please post in this Ubuntu Forums thread or leave a comment on my blog.

I will not give help to people posting in the above places. If you require technical support, start a support thread on the Ubuntu Forums. That is the appropriate place to ask for help.