Cannot resolve symbol "CollectNewspaperKarel"

Question

I've been trying to make CS106A work on my computer for ages, and it seems that I am missing out on a huge part of my Java education, because I keep on hearing stuff about dependencies, and classpaths, and have entered in too many lines into cmd that I have no idea what they did.

My most recent problem has been when I was merely testing the Karel program, I imported it like it said I should on IntelliJ's website, and I think I got most things right, the karel.jar is in the dependencies tab and whatnot, but when I try to run this code it says "Cannot resolve symbol 'CollectNewspaperKarel', I have no idea what its referring to, and all the other answers that I've seen talk in some gibberish that I don't understand. So if someone could explain to me the massive hole in my knowledge, or at least what its called so I can watch a video on it... that would be great.

/*
 * File: CollectNewspaperKarel.java
 * --------------------------------
 * At present, the CollectNewspaperKarel subclass does nothing.
 * Your job in the assignment is to add the necessary code to
 * instruct Karel to walk to the door of its house, pick up the
 * newspaper (represented by a beeper, of course), and then return
 * to its initial position in the upper left corner of the house.
 */

import stanford.karel.*;

public class CollectNewspaperKarel extends Karel {
    public void run() {
        move();
        turnRight();
        move();
        turnLeft();
        move();
        pickBeeper();
    }
}