Hi sanjshah,
1) you're referring to ".logo", which is a jQuery style selector. You'll need to declare a jQuery library to be able to use it's selector engine.
2) you need to add a little bit of CSS code, since you're trying to move .logo towards the right. position: relative; does that for you (for example).
I've completed your tutorial code to get you started (really simple example, exactly like the one you're trying out in your tutorial).
Copy paste this to your computer file (you've called it "TweenMaxTest.html") and you're good to go!"
Happy Tweening!
Jos
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<script src="https://code.jquery.com/jquery-1.12.3.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/gsap/1.18.4/TweenMax.min.js"></script>
</head>
<body>
<div class="logo" style="background-color: red; height: 50px; width: 50px; position: relative;"></div>
<script>
TweenMax.to(".logo", 12, {left:600});
</script>
</body>
</html>
JD9's post in Tutorial animation does not work was marked as the answer