how would I add jump to my mecanim free form script

[code=CSharp]using UnityEngine; using System.Collections;

public class Movement : MonoBehaviour {

 Animator anim;

 bool grounded = false;
 public Transform groundCheck;
 float groundRadius = 0.2f;
 public LayerMask whatIsGround;


 // Use this for initialization
 void Start () {
  
     anim = GetComponent<Animator> ();
 }

 void FixedUpdate (){
 
     grounded = Physics2D.OverlapCircle (groundCheck.position, groundRadius, whatIsGround);
     anim.SetBool ("Ground", grounded);

 }

 // Update is called once per frame
 void Update () {

     float input_x = Input.GetAxisRaw ("Horizontal");
     float input_z = Input.GetAxisRaw ("Vertical");

     bool IsWalking = (Mathf.Abs (input_x) + Mathf.Abs (input_z)) >0;
     anim.SetBool ("IsWalking", IsWalking);
     if (IsWalking)
     {
         anim.SetFloat ("x", input_x);
         anim.SetFloat ("z", input_z);

         transform.position += new Vector3(input_x, 0f, input_z).normalized * Time.deltaTime;
         if (grounded && Input.GetKeyDown (KeyCode.Space))
         {
             anim.SetBool ("Ground",false);
         }
     }
 }

}[/code]

So where would I add my boolean in and how would it trigger it or is there better way of adding a junk to a free form direction mecanim controller because I've been on this for 4 days now