How to connect Ping sensor to this Motor shield?

Hy after i connect the 2 DC motors i want to connect 4 ping Sensor and i don’t know were to connect them. I’m a nooby at this plz help. this is the shield => http://www.robotshop.com/eu/dfrobot-arduino-compatible-motor-shield-2a-2.html <=

well the link says it all the pins other than 4,5,6,7 there is a lot more pins left you can easily use four ping)) sensors along with this sheild and looks like you didnt look closely i found this on the website itself http://www.robotshop.com/eu/content/PDF/manual-dri0009.pdf :)

Thank you very much ! :D ;D