I have this code and it is a reaction light game. when you press the button on pin 11 it starts the game and the lights should osculate back and forth. the main goal is to press the button when it hits the middle led and the osculating will slow down. i cannot get the leds to turn on help?`int ledPin;

    `int ledPin;
    int direction;
    int isChanging;
    unsigned long lastChange;

void setup() {
   //set pins 2 to 10 to be output
  // and LEDs off
   int pin;
    for (pin = 2; pin <= 10; pin++) {
       pinMode(pin, OUTPUT);
       digitalWrite(pin, LOW);
    }
     //set pin 11 to be input
     pinMode(11, INPUT);

     ledPin = 2;
     direction = 1;
     lastChange = millis();
  }

 void loop() {
    if (isChanging) {
    if (millis() - lastChange > 500) {
        //turn off old LED
        digitalWrite(ledPin, LOW);
        //reset time
        lastChange = millis();
        //change the led
        ledPin = ledPin + direction;
        if (ledPin > 10) {
          direction = -1;
        ledPin = 9;
      } else (ledPin < 2); {
        direction = +1;
        ledPin = 3;
     }

       //turn on new LED
        digitalWrite(ledPin, HIGH);
     }
       //check for button
       if (digitalRead(11)) {
        isChanging = 0;
     }
     }
    else {
       //wait for them to let go of the button
       while (digitalRead(11)) {
     }
       //wait for it to be pressed again
       while (!digitalRead(11)) {
     }
       //wait for them to let go of the button
       while (digitalRead(11)) {
     }
    }
   }`

I have this code and it is a reaction light game. When you press the button on pin 11 it starts the game and the lights should osculate back and forth. The main goal is to press the button when it hits the middle led and the osculating will slow down. I cannot get the leds to turn on help?

    int ledPin;
    int direction;
    int isChanging;
    unsigned long lastChange;

void setup() {
   //set pins 2 to 10 to be output
  // and LEDs off
   int pin;
    for (pin = 2; pin <= 10; pin++) {
       pinMode(pin, OUTPUT);
       digitalWrite(pin, LOW);
    }
     //set pin 11 to be input
     pinMode(11, INPUT);

     ledPin = 2;
     direction = 1;
     lastChange = millis();
  }

 void loop() {
    if (isChanging) {
    if (millis() - lastChange > 500) {
        //turn off old LED
        digitalWrite(ledPin, LOW);
        //reset time
        lastChange = millis();
        //change the led
        ledPin = ledPin + direction;
        if (ledPin > 10) {
          direction = -1;
        ledPin = 9;
      } else (ledPin < 2); {
        direction = +1;
        ledPin = 3;
     }

       //turn on new LED
        digitalWrite(ledPin, HIGH);
     }
       //check for button
       if (digitalRead(11)) {
        isChanging = 0;
     }
     }
    else {
       //wait for them to let go of the button
       while (digitalRead(11)) {
     }
       //wait for it to be pressed again
       while (!digitalRead(11)) {
     }
       //wait for them to let go of the button
       while (digitalRead(11)) {
     }
    }
   }`