Find an object after it spawns

I know that I not the first that ask that question but I can't find a good answer for my problem.

When my character getting hit, there is a "force shield" that sapwns and defend me from hits for 5 seconds. When it spawns, it should move with me, but it not, it just spawns and stay in the same plase all the time. I tried to get help from this answer but now the shield move always on the Z axis and not after me (it spawns and move on the Z axis even when I don't move). How I can make the shield go with me and always be excatly on the player position?

This is what I did:

 var target : Transform;
  var damping = 6.0;
  var speed = 20.0;
  
  function Awake()
  {
      target = GameObject.FindWithTag("Player").transform;
  }
  
  function Update ()
  {
      var rotation = Quaternion.LookRotation(target.position, transform.position);
      transform.rotation = Quaternion.Slerp(transform.rotation, rotation, Time.deltaTime * damping);
      
      transform.Translate(Vector3.forward * speed * Time.deltaTime);
  }

(I can't set the "target" var in the inpector).

Sorry for poor english.