It says I have to go to the input manager and input the following code and I don't know how to do that./ Help Please? Anybody/

using UnityEngine; using System.Collections;

[RequireComponent(typeof(CharacterController))] public class PlayerMovement : MonoBehaviour { public bool canControl = true;

 public float runSpeed = 5.0f;
 public float sprintSpeed = 8.0f;
     
 public AnimationCurve slopeSpeedMultiplier = new AnimationCurve(new Keyframe(-90, 1.5f), new Keyframe(0, 1), new Keyframe(90, 0));
     
 public float crouchSpeedModifier = 0.55f;
 public float normalHeight = 1.75f;
 public float crouchHeight = 1.0f;
 
 public float gravity = 9.81f;
 public float maxFallSpeed = 100.0f;
     
 public float jumpHeight = 2.0f;
 
 public LayerMask crouchDetect;
 public float pushPower = 1.6f;
 
 [HideInInspector] public CollisionFlags collisionFlags; 
 [HideInInspector] public bool grounded;
 [HideInInspector] public bool sprinting;
 [HideInInspector] public bool crouching;
 [HideInInspector] public bool inAir;
 [HideInInspector] public bool floating;
 [HideInInspector] public float impactVelocity;
 [HideInInspector] public CharacterController controller;

 private bool dontStand = false;
 private RaycastHit ds;
 private float moveSpeedAim;
 private float curSpeed;
 private Vector3 moveDirection;
 
 void Start() {
     controller = GetComponent<CharacterController>();
     moveSpeedAim = 1;
 }
 
 void LateUpdate() {
     if(!grounded) {
         impactVelocity = -controller.velocity.y;
         floating = true;
     }
 }
 
 void Update() {
     grounded = controller.isGrounded;
     if(grounded) {
         moveDirection = new Vector3(Input.GetAxis("Horizontal") * moveSpeedAim, -1, Input.GetAxis("Vertical") * moveSpeedAim);
         
         if(moveDirection != Vector3.zero) {
             float directionLength = moveDirection.magnitude;
             moveDirection /= directionLength;
             directionLength = Mathf.Min(1, directionLength);
             directionLength  = Mathf.Pow(directionLength, 2);
             moveDirection *= directionLength;
         }
         
         moveDirection = transform.TransformDirection(moveDirection);
         
         if(Input.GetButton("Run") && Input.GetAxis("Horizontal") == 0 && Input.GetAxis("Vertical") > 0 && !crouching && controller.velocity.magnitude > 0.5f) {
             moveDirection *= sprintSpeed;
             sprinting = true;
         }
         else if(crouching && !sprinting) {
             moveDirection *= runSpeed * crouchSpeedModifier;
         }
         else {
             moveDirection *= runSpeed;
             sprinting = false;
         }
         
         if(Input.GetButton("Jump")) {
             moveDirection.y = jumpHeight;
         }

         if(Physics.Raycast(transform.position, transform.up, out ds, (controller.height * 0.5f) + 0.1f, crouchDetect.value)) {
             dontStand = true;
         }
         else {
             dontStand = false;
         }
     
         if(!sprinting) {
             if(Input.GetButton("Crouch")) {
                 controller.height = Mathf.Lerp(controller.height, crouchHeight, Time.deltaTime * 6);
                 controller.center = new Vector3(0, Mathf.Lerp(controller.center.y, -((normalHeight - crouchHeight) / 2), Time.deltaTime * 6), 0);
                 GameObject.Find("Head").SendMessage("CrouchMoveY", -(normalHeight - crouchHeight));
                 crouching = true;
             }
             
             if(!Input.GetButton("Crouch") && !dontStand){
                 controller.height = Mathf.Lerp(controller.height, normalHeight, Time.deltaTime * 6);
                 controller.center = new Vector3(0, Mathf.Lerp(controller.center.y, 0, Time.deltaTime * 6), 0);
                 GameObject.Find("Head").SendMessage("CrouchMoveY", 0.0f);
                 crouching = false;
             }
         }
     }
     else {
         inAir = true;
     }
     
     if(moveDirection.y > -maxFallSpeed) {
         moveDirection.y -= Time.deltaTime * gravity;
     }
     
     controller.Move(moveDirection * Time.deltaTime);
 }
 
 void OnControllerColliderHit (ControllerColliderHit hit) {
 }
 
 public void SlowWhenAim(float spd) {
     moveSpeedAim = spd;
 }

}