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I can't tell exactly whats not working with your code,it would be really helpful if you elaborate more. But here is I report some code that I wrote and I think it will get the job done:

//declare our variables:
int myPins[] = {2, 4, 8, 3, 6}; //Enter the number of the pins being used
int RNum = 0;

void loop()
{
    DigitalWrite(myPins[RNum],LOW);
    RNum = Random(0,MAX) // MAX being the number of LEDs connected minus one 
    //the above generates a random number
    DigitalWrite(myPins[RNum],High);
}

This will turn on one LED at a time.