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 manager.
To burn your ISO, launch K3B and click "Tools → Burn Image...", as seen in Figure X-XX:
A new window, seen in Figure X-XX, will launch so that you can choose your .iso file. Under "Image to burn", click the blue folder icon to select your file:
Once your file is listed, click the "Start" button in the top-right corner, and K3B will burn the .iso file onto your DVD.