Did you use the tool to make a bootable usb drive, or did you just copy it to the drive? If you just copied it then it wont work.
Otherwise you must not be setting something wrong because if it will give you the No OS found error with no drive plugged in then it is trying to boot from a drive. Thus you just need to set it correctly to boot from USB drive. Some motherboards will only boot from USB drive if you have the usb drive selected in hard disk group, and hard disk group selected as first boot device.
On some older motherboards it does not have support for booting from usb 3.0 port, so you still have to use USB 2.0 port (3.0 = blue port, 2.0 = black)