lcd 16x2

i want to run 100 to 0 in my lcd 16x2 with arduino uno please help me

So you want to make a count down timer which runs from 100 to 0 in increments of x milliseconds.
First find an online tutorial and get to the stage of printing "Hello World" on the LCD.

(deleted)

Make a variable like this:

int counter = 0;

Use it like this:

counter++;

Then finally print it the the lcd with a delay:

lcd.print(counter);
delay(1000);

I hope this clears things up for you!