Then we can help get it working.
At the very least, you'll need to provide a LOT more information. Which wires on the keypad are row wires? Which are column wires? Which pins on the Arduino are the row wires to connect to? Which are the column wires to connect to?
When you have that data, we'll have a bunch more questions.
As you can probably guess, no one can write code for you without knowing that information. Testing the hardware is simple. Load one of the Keypad library examples, and open the serial monitor app. Press some keys; see some results.
Once that works, we can (help you) tackle the next part - storing the key presses.