Using K3B in KDE
Note: depending upon your distribution, K3B may or may not be included with the installation of KDE. If it does not appear in the KDE application launcher, you should be able to install it using your operating system's software management system.
To burn your ISO, launch K3B and click "Tools → Burn Image...". Figure X-XX demonstrates the initial screen on a KDE4 system:
A new window, seen in Figure X-XX, will launch. Click the blue folder to browse to the location of your .iso file.
Once your file is listed, ensure a blank DVD is inserted and click the "Start" button. K3B will automatically eject the DVD once the burn is complete.