Moving UI Image

I am not sure how to go about moving canvas elements via script. I have a little glow bug that is an image within my canvas, with a script attached. If the glow bug was not in the canvas and i was moving it with the script it would work. The script for gameplay glow box movement( I just want it to float around in a "box" basically).

 using UnityEngine;
 using System.Collections;
 
 /// <summary>
 /// Fly movement.
 /// This script establishes a very simple movement for the fly sprite
 /// A random position will be calculated and the fly will move towards it
 /// The fly will remain bounded within a x y perimeter and a new position 
 /// will be calculated within a timer interval
 /// </summary>
 //*********************************************
 public class flyMovement : MonoBehaviour
 {
     //Bounds that the fly will stay in
     //*************************
     public float maxX =  0.5f;
     public float minX = -0.5f;
     public float maxY =  0.5f;
     public float minY = -0.5f;
     //*************************
 
     //The time it takes to calculate a new random position the fly will move towards
     private float tChange = 0f; // force new direction in the first Update
 
     //Coordinates we will move towards
     private float randomXCoord;
     private float randomYCoord;
 
     //How fast to move 
     public float moveSpeed = 0.1f;
     private RectTransform Rect;
 
 
     void Start()
     {
         Rect = this.gameObject.GetComponent<RectTransform> ();
     }
 
 
     private void Update ()
     {
         // Change to random direction at random intervals
         // Should step into on the first update
         if (Time.time >= tChange)
         {
             //Generate an x and y value in the range below
             randomXCoord = Random.Range(-2.0f,2.0f); // with float parameters, a random float
             randomYCoord = Random.Range(-2.0f,2.0f); // between -2.0 and 2.0 is returned
 
 
             // set a random interval between 0.5 and 1.5
             tChange = Time.time + Random.Range(0.5f,1.5f);
         }
         //Translate to 
         Vector3 translateVec = new Vector3 (randomXCoord, randomYCoord, 0.0f) * moveSpeed * Time.deltaTime;
         transform.Translate(translateVec);
         
 
 
 
         //Position bounding
         //***************************************************************
         // if object reached any border, revert the appropriate direction
         if (transform.position.x >= maxX || transform.position.x <= minX)
         {
             //Flip it so it goes in the opposite x direction
             randomXCoord = -randomXCoord;
         }
         if (transform.position.y >= maxY || transform.position.y <= minY) 
         {
             //Flip it so it goes in the opposite y direction
             randomYCoord = -randomYCoord;
         }
 
         // make sure the position is inside the borders
         float xCoord = Mathf.Clamp(transform.position.x, minX, maxX);
         float yCoord = Mathf.Clamp(transform.position.y, minY, maxY);
 
         Vector3 tempVec = new Vector3 (xCoord, yCoord, transform.position.z);
         transform.position = tempVec;
         
         //**************************************************************
     }
 }

I am not sure what to do with the rect transform. Does anyone know how to modify the above script in order to work with the glowbug being an image within the canvas?