http://5ekxbftvqg26oir5wle3p27ax3wksbxcecnm6oemju7bjra2pn26s3qd.onion/releases/stable/i386/ch05s01.vi.html
All help screens have a boot prompt at which the boot command can be typed: Press F1 for the help index, or ENTER to boot: At this boot prompt you can either just press Enter to boot the installer with default options or enter a specific boot command and, optionally, boot parameters.