Hi, I have created a sketch and when I try to upload it to my uno my computer says: programmer is not responding

I am only 12 years old and my Dad tried everything to get the program to upload to the uno. I need help! When I'm uploading the sketch the LEDs blink so I think its connected to my computer properly. I tried everything to get it to work I even tried changing the serial port and it didn't work.
Here's the code I tried to upload when this happens incase it's causing this:
const int LED1 = 0; // Set the digital pin for the LEDs.
const int LED2 = 1;
const int LED3 = 2;
const int LED4 = 3;
const int LED5 = 4;
const int LED6 = 5;
const int LED7 = 6;
const int LED8 = 7;
const int LED9 = 8;
const int LED10 = 9;
const int LED11 = 10;
const int LED12 = 12;
const int LED13 = 13;
void setup() {
pinMode(LED1, OUTPUT); //Declare the pins that the LEDs are connected to
pinMode(LED2, OUTPUT); //as "OUTPUTS"
pinMode(LED3, OUTPUT);
pinMode(LED4, OUTPUT);
pinMode(LED5, OUTPUT);
pinMode(LED6, OUTPUT);
pinMode(LED7, OUTPUT);
pinMode(LED8, OUTPUT);
pinMode(LED9, OUTPUT);
pinMode(LED10, OUTPUT);
pinMode(LED11, OUTPUT);
pinMode(LED12, OUTPUT);
pinMode(LED13, OUTPUT);
}
void loop() {
digitalWrite(LED1, HIGH);
delay(500);
digitalWrite(LED1, LOW);
digitalWrite(LED2, HIGH);
delay(500);
}