by Singular » Fri Feb 03, 2012 7:53 pm
Sure you can. If you go to the image, you will see buttons at the top, next to the image title that say "delete image" and "edit file information". Edit file information allows you to change the thumbnail and update image details, not changing the actual imjage. To do that, you would have to delete the image and upload a new one. let me know if you need any additional help.
all the best,
Joe