PID Controller help

Technical Java
1

So I followed the example on here.

http://wpilib.screenstepslive.com/s/3120/m/7912/l/79828-operating-the-robot-with-feedback-from-sensors-pid-control

So this is what I got so far.

The PID Controller is plugged in on PWM port 0 and AnalogInput 2

How do I call this in the Robot.java and what do I do next?
I am using IterativeRobot


import edu.wpi.first.wpilibj.command.PIDSubsystem;
import edu.wpi.first.wpilibj.livewindow.LiveWindow;
import edu.wpi.first.wpilibj.Talon;
import edu.wpi.first.wpilibj.SpeedController;
import edu.wpi.first.wpilibj.AnalogInput;
import edu.wpi.first.wpilibj.*;
/**
 *
 */
public class PIDWheel extends PIDSubsystem {
	SpeedController motor = new Talon(0);
	AnalogInput pot = new AnalogInput(2);
	
    // Initialize your subsystem here
    public PIDWheel() {
    	super("Wheel", 1.0, 0.0, 0.0);
    	setAbsoluteTolerance(0.2);
    	getPIDController().setContinuous(false);
    	LiveWindow.addActuator("Wheel", "PIDSubsystem Controller", getPIDController());
        // Use these to get going:
        // setSetpoint() -  Sets where the PID controller should move the system
        //                  to
        // enable() - Enables the PID controller.
    }
    
    public void initDefaultCommand() {
        // Set the default command for a subsystem here.
        //setDefaultCommand(new MySpecialCommand());
    }
    
    protected double returnPIDInput() {
        // Return your input value for the PID loop
        // e.g. a sensor, like a potentiometer:
        // yourPot.getAverageVoltage() / kYourMaxVoltage;
    	return pot.getAverageVoltage();
    }
    
    protected void usePIDOutput(double output) {
    	motor.pidWrite(output);
        // Use output to drive your system, like a motor
        // e.g. yourMotor.set(output);
    }
}