Can anyone help me

Using Arduino Project Guidance
21

Perhaps you can review some of the other posts that show you how to properly post code.

22

Ok now that I know how to post code lets continue.

I'm using just the array function right now.

int timer = 5000;           // The higher the number, the slower the timing.
int ledPins[] = { 
  9, 10, 12, 11 };       // an array of pin numbers to which LEDs are attached
int pinCount = 4;           // the number of pins (i.e. the length of the array)

void setup() {
  // the array elements are numbered from 0 to (pinCount - 1).
  // use a for loop to initialize each pin as an output:
  for (int thisPin = 0; thisPin < pinCount; thisPin++)  {
    pinMode(ledPins[thisPin], OUTPUT);      
  }
}

void loop() {
  // loop from the lowest pin to the highest:
  for (int thisPin = 0; thisPin < pinCount; thisPin++) { 
    // turn the pin on:
    digitalWrite(ledPins[thisPin], HIGH);   
    delay(timer);                  
    // turn the pin off:
    digitalWrite(ledPins[thisPin], LOW);    

  }

  // loop from the highest pin to the lowest:
  for (int thisPin = pinCount - 1; thisPin >= 0; thisPin--) { 
    // turn the pin on:
    digitalWrite(ledPins[thisPin], HIGH);
    delay(timer);
    // turn the pin off:
    digitalWrite(ledPins[thisPin], LOW);
  }
}

I fixed the issue of some lights staying on longer than other by changing "for (int thisPin = pinCount - 1; thisPin >= 0; thisPin--)" to "for (int thisPin = pinCount - 2; thisPin > 0; thisPin--)"

Now I need to randomize the sequence