passcode with Keypad.h and Password.h

I have googled how to have a reprogram-able passcode using Keypad.h and Password.h and all I seem to stumble upon is a couple people asking the same thing but none that have anything helpful. right now all I have is some basic code and I want to make sure I have the this feature before I continue with anything else.

#include <Keypad.h>
#include <Password.h>

char* epass;
Password password = Password(epass);

const byte ROWS = 4;
const byte COLS = 3;
char keys[ROWS][COLS] = {
  {'1','2','3'},
  {'4','5','6'},
  {'7','8','9'},
  {'*','0','#'},
};
byte rowPins[ROWS] = {7, 12, 11, 9};
byte colPins[COLS] = {8, 6, 10};

Keypad keypad = Keypad( makeKeymap(keys), rowPins, colPins, ROWS, COLS );

byte locked;

void setup(){
  Serial.begin(9600);
  keypad.addEventListener(keypadEvent);
  keypad.setDebounceTime(75);
  locked = 1;
}

void loop(){
  char key = keypad.getKey();
}

void keypadEvent(KeypadEvent eKey){
  switch (keypad.getState()){
    case PRESSED:
      Serial.print(eKey);
      switch(eKey){
        case'#':guessPassword();
        break;
        default:password.append(eKey);
      }
  }
}

void guessPassword(){
  if (password.evaluate()){
    Serial.println("VALID PASSWORD");
    locked = 0;
  }
  else{
    Serial.println("INVALID PASSWORD");
    password.reset();
    locked = 1;
  }
}

and I want to make sure I have the this feature before I continue with anything else.

Something seems to have gotten left out of that sentence. Like any meaning.