Arduino LCD Random message

Remove the test for the button and add a suitable delay between passes.

void loop(void)
{
  reply = random(14);
  lcd.clear();

  lcd.setCursor(0, 0);

  switch(reply)
  {
    // Code to print a message here
  }

  // delay takes an argument in milliseconds - multiply by 1000 to get seconds.  This will delay 5 seconds
  delay (5000);
}