undo send to back

I added an image to a slide in my project and chose send backward and now it is appearing on all slides after that slide. I don't believe I inidcated it to appear for rest of project. If I did how do I do it. I cannot access the image when I click on it I don't get any tags around it. I had placed a highlight box over it and the image didn't appear correctly so I thought by sending it backward would blend it better into the slide but now I have created an issue with it appearing on subsequent slides. Help. Thanks.