i dont know to use a 4x4 tactile button keypad

i recently bought a 4x4 tactile button keypad module from ebay and i cant find any documentation on how to use it. Could someone help me? Heres the link http://www.ebay.com/itm/Keypad-MCU-Accessory-Board-Matrix-Keyboard-Buttons-4x4-Brand-new-/221566043768?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2047675.l2557&nma=true&si=dzEboq6euzCFVzQ7dk2Oc%252FGy24c%253D&orig_cvip=true&rt=nc

Can you use google? First hit:- http://playground.arduino.cc/Main/KeypadTutorial

what i meant i didnt know what pin did what, because i didnt have any datasheet. But seller recently sent me some reference so i know now. Thanks for the help atleast

REGFly: what i meant i didn't know what pin did what

Easily sorted using a $5 multimeter (or an Arduino in this case). If you don't have a multimeter, you face real problems.