Trouble with scripting the movement of my 2D blend tree

I created a 2D blend tree that blends a forward and backward walk animation with a left and right sidestep animation. It works in the preview window but it's not working in-game. Here is a screen of the blend tree:



Here is my current script:

Code (csharp):

1. public class PlayerControllerScript : MonoBehaviour {
2.  
3.     Animator anim;
4.    
5.     // Use this for initialization
6.     void Start () {
7.        
8.         anim = GetComponent<Animator>();
9.        
10.     }
11.    
12.     // Update is called once per frame
13.     void Update () {
14.        
15.         float move = Input.GetAxis("Vertical");
16.         float sidestep = Input.GetAxis("Horizontal");
17.         anim.SetFloat("Speed", move);
18.         anim.SetFloat("Direction", sidestep);
19.        
20.     }
21. }
22.  
23.  

In the Animator, Speed and Direction are increasing and decreasing correctly with the right input but my character is not moving. Is there a problem with my script, my blend tree, or both?

 

I've been looking at some other examples, trying to get a better understanding.

If VelocityX (horizontal movement) and VelocityZ (vertical movement) are the two parameters in my 2D blend tree, I have to calculate these two parameters and apply them to horizontal and vertical inputs? Am I getting close to understanding this?