If u have the ISO file, then you have to burn that ISO on DVD n boot from that DVD.
AFAIK, Digit DVD is bootable in Fedora9 :/
If the DVD is bootable, you just need to put it in your drive and boot using that . But if it is an iso image, you have to burn it to a dvd , which would become bootable and you boot ur computer using that. Only one iso file will be there .
Thanks guys i've installed fedora directly through the Digit DVD and it runs fine.......However during the installation media test procedure it showed that there is error in the volume descriptor and it just ejects the DVD.......So i skip the test.....Anyway it runs fine now........My system is AMD Athlon 64 X2 3600+,2GB RAM,nVidia nForce630 MCP,XFX nVidia GeForce 7600GT XXX Edition.......