Display downloaded image as new Sprite

So far I managed to download an Image and transform it into a Texture2D using this code:

   public class ChangeTextureToImage : MonoBehaviour {
     
         string url = "...";
         Texture2D imgTexture;
     
         public void getImageClick () {
     
             StartCoroutine (LoadImg());
         }
         IEnumerator LoadImg(){
     
             yield return 0;
             WWW imgLink = new WWW (url);
             yield return imgLink;
             imgTexture = imgLink.texture;
         }

Now I want to use this Texture to be displayed on a existing or new Sprite. I am familiar with this answer, but can't figure it out, how to use it on a material (don't understand this part:

 public Material defaultMaterial; //prefab material set already 

). How can I solve this? I tried and researched for the answer, but havent been able to solve it yet. Do you have an idea? Any help would be appreciated. Thanks