How do I get a character to move (Without the default scripts, which don't seem to work)?

I’m basically making a test/joke game, so I don’t care about the details too much, just want to make something actually happen. This is my first time trying to use Unity.
The character is a rectangular prism with no animations. I have a rigidbody, a box collider, and the script “moving better hopefully”, which I found online (I named it though)

using UnityEngine;
using System.Collections;

public class movingBetterHopefully : MonoBehaviour {

public float speed;

private Rigidbody rb;

void Start ()
	rb = GetComponent<Rigidbody> ();

void FixedUpdate ()
	float moveHorizontal = Input.GetAxis ("Horizontal");
	float moveVertical = Input.GetAxis ("Vertical");
	Vector3 movement = new Vector3 (moveHorizontal, 0.0f, moveVertical);
	rb.AddForce (movement * speed);


(Sorry for the formatting…)

I can set the inputs when I build the game, but the character can’t actually move. What do I need to do here? Thanks in advance, and sorry for being pretty ignorant about the whole process… I’ve been trying to get this working for probably a week now and getting pretty frustrated.

What is your Speed value? If the value equal 0 then it wont move. if the value less then ~10… 15… and the Mass of your Rigidbody is 1 then it move very very very very slow until nothing.

Be sure the Speed is != 0 and Lower the Mass || increase the speed * 10 or 100