Bitmap Object Background Removal

I need to remove a background from an object which I have imported into Photo Paint and by using the Wand have removed the white background.  But when I go to export it and save it as a png file it puts the white background back in with the saved file.  Can someone help me with this.  I need the object to have a transparent background so that I can place it overtop other objects and not see the white of the background.  Thanks again for any advice Smile