People hes asking how to take the iso and put it on a disc.
Use whatever mounting program you used to burn the iso to a disc, as most mounting programs come with the ability to burn isos to discs. Burn it to a DVD and when your computer is starting up, there should be an option for 'Boot menu' or similar that you can select to chose what you want to boot from. Pick your right CD/DVD drive and it should start loading from there.