If there is a lock on the layer, drag the lock to the trash
Hold down the Cmd key and click on the Create a New Layer symbol in the Layers panel to place a layer below the image layer.
Edit > Fill with White
Return to the image layer
Choose the Magic Wand and click in the black area
Strike the Delete key
Choose Layer > Flatten Image
...or just crop it. That black "background" is in fact part of your image.
Select the part of the image that you want to keep > under Select choose Inverse > then under Edit Fill with White
Thank you so much - that worked!! I appreciate your help very much!
kjoseph - what worked?