Why doesn't my circuit work?

Hello. I copied a circuit from online and pasted it. I used the same code, but it doesn't work for me. Why? I only used one motor, so I didn't connect ENA, IN1, and IN2 at all.

int motor1pin1 = 2;

int motor1pin2 = 3;

void setup() {

// put your setup code here, to run once:

pinMode(motor1pin1, OUTPUT);

pinMode(motor1pin2, OUTPUT);

pinMode(9, OUTPUT);

}

void loop() {

// put your main code here, to run repeatedly:

//Controlling speed (0 = off and 255 = max speed):

analogWrite(9, 100); //ENA pin

//Controlling spin direction of motors:

digitalWrite(motor1pin1, HIGH);

digitalWrite(motor1pin2, LOW);

delay(1000);

digitalWrite(motor1pin1, LOW);

digitalWrite(motor1pin2, HIGH);

delay(1000);

}