Motor shield r3

I have a new motorshield r3 and I can not find any tutorials on how to use it. I want to run 2 dc motors at the same time. I have 4 wires 2 from each motor in the plus and minus inputs on the shield. Then next to it are the Vin and Gnd inputs. I put a wire from vin to vin on the arduino pins. I also Have a wire running from GND to Gnd on the ardiuno next to pin 13. Is this setup correct? (it’s probably not) I read something about the motors needing their own source of power other than the 9v battery that I have connected to the arduino in the power input. How would I wire this to make it work?

this is a picture of what I have

Check this out:

Thanks a lot know I know how to use it!