void setup() {
  // put your setup code here, to run once:
 Serial.begin(9600);
 pinMode(13, OUTPUT); 
}

void loop() {
  // put your main code here, to run repeatedly:
  digitalWrite(13, HIGH);
  Serial.println("LED ON");
  delay(2000); //wait for 2 secs
  digitalWrite(13, LOW);
  Serial.println("LED OFF");
  delay(1000); //wait for 1 sec
}
// This is correct, however you should have printed before you turned the LED off/on