Pinpad security w/LCD using Arduino Uno

I'm trying to design a project that will use a pin code to activate a relay with a certain code. Also, I want to use a LCD screen to display "Enter Code, Code incorrect," etc. Here is exactly what I'm looking for but can't find any diagrams or write ups.

Thanks for any help!

Show us what you have done so far.
Have you worked through the basic sketches which one with the IDE?

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