Don't Understand How To Operate AdaFruit Pump

Thank You. I am new to electronics and Arduino, so I will start by just operating one pump. I have the following:

  1. Arduino Uno
  2. Arduino Motor Shield
  3. 12V motor (adafruit pump)

I have a 12V external power supply as well (wall-wart). If anyone could help with how to create the circuit and create the Arduino code so I can at least power the pump on and off...it would be much appreciated.