Passwords on program

i have a project that first asks me to login then if my access is granted or password is correct program will ask me if i want to change password or print something on lcd

if anyone has the code please send me reply ty

Login from where? The serial port?

aarg:
Login from where?

.... and into what?

i mean login on the program. the program first will ask me to login then i get to choose to change password or print something on the serial monitor or lcd

aarg:
Login from where? The serial port?

kenwood120s:
.... and into what?

Arduinomagics:
i mean login on the program.

I (and I guess the other posters) got that part.
Now we still need to know the rest.

If you're going to ask for someone to give you free help or a complete program, the very least you could do is put some effort into asking a good question.
What components do you have? What interfaces? Are you one of those people who claims to have searched and found nothing on the whole of the internet?