Clipart Of All Littlest Pet Shop How Can I Undo Something On Photoshop?

How can I undo something on photoshop? - clipart of all littlest pet shop

I have a picture with Photoshop. I clip art from three different images and has a large table with all the clip art created by small tables. I took the larger store closed photoshop without saving. I wanted to go back to the picture and moving images quickly to another location and a little more, but they can, because it does not save the image exactly how it was. Can I allow something to me to do this or should I only take pictures and basically start all over again? Thanks