pgogramming a 4x4 keypad

hi guys quick question need help
how do you get a 4x4 keypad to programme as i have got code for it and when trying to add said code to
my UNO R3 it wont sync says:

#include <Keypad.h>

^

compilation terminated.

exit status 1
Error compiling for board Arduino/Genuino Uno.

is there another way of wording this or something?

Is there some more error message?

hi pal dont worry i was being a plonker iam new to it all and just found out i needed to add the keypad to my library in sketch so now i have done that it has started to accept the code lol thanks anyway