From my understanding the instructions want you to make a flash drive bootable, but I believe this can only be done with a floppy, so just format a floppy to be bootable and copy it to the flash drive. I've never done that but it should work. In My Computer, right-click on the floppy, select format, check "Quick Format" and "Create an MS-DOS startup disk," and click start.
Those instructions from that forum
got really weird on step 2 of the USB drive part. Sorry.