Select the unit where you want to store the boot disk and click on the 'Install' button. To run DBAN you have to restart your computer and change the startup order. Careful, though – some PCs do not allow you to boot the system from a USB device.
Darik's Boot And Nuke also has a version for CD/DVD drives. Download the disk image in ISO format by clicking here and recording it on a blank CD/DVD.
The data deleted with Darik's Boot And Nuke are irretrievable, so it's very useful for comprehensively reformatting systems.