A white board says if it is empty, fill it.
A white board that has instructions, including a rule that if it's empty, fill it.
A white board has a list of steps and the first one is if it is empty, fill it.
A list on a whiteboard with 4 steps and a diagram of a circuit, one of the steps is Add LEDs.
A whiteboard has 4 steps of doing things next to a diagram of a circuit.