Hi desoft,
Welcome to Techspot.
You will need to install something like MagicISO or NERO to burn to disc. Once this has been installed you will be able to double click on the ISO file and the rest will be done by the software.
To boot from CD/DVD make sure it has been changed correctly in the BIOS.
On booting your PC press F2 or DEL to get into your BIOS.
There you can change your boot priority. Change it to your CD/DVD drive and save the cnages and exit. Your PC will reboot.
hope this Help
James