Connecting blynk over usb

Hey,

I am trying to set up my Arduino Uno with Blynk over USB using this https://codebender.cc/example/BlynkSimpleEthernet/BoardsAndShields:Arduino_Serial_USB#Arduino_Serial_USB.ino however when I try to send the blynk-ser.bat file with the CMD I get a DSR is OFF and nothing is happening. Could you help me?
Thanks

Check this updated doc.

Thank you, it is now working.