Restart your computer. As the computer starts, watch for a message that tells you to press a certain key to choose a boot device. The key varies from computer to computer but, on many systems, the required key will be F12, F2, F1, Esc, or Delete. Press the required key and select the CD or DVD drive that contains your disc.
If your computer does not offer you a boot menu, and a Fedora boot screen does not appear shortly after the computer starts, you might need to change the computer's boot sequence in its BIOS. Refer to the documentation that came with your computer for instructions. The details of this procedure vary widely from computer to computer.