secondary LED on Arduino Uno board will not light up properly.

Other Hardware LEDs and Multiplexing
4

"All we had to do was type pinMode("led name", OUTPUT);
That should set up the ground port for the LED."

before setup declare the new LED and pin connection :-

int ledname = 8;

And then in Setup

pinMode("ledname", OUTPUT);

and in loop

digitalWrite ( ledname , HIGH);

and the LED connected to pin 8 ( via a resistor ! ) should light...