To make changes to images that are already published, click on the little arrow next to your profile picture in the upper right corner. Choose "Image Library" and then "My files”
Once you are in your Mediacloud, click on the image/images you want to change and make the changes in the "tool box" to the right.
If you have only selected and changed one image, the changes are saved automatically. If you have selected and changed several images at once, a "Save" button will appear.
Contact email@example.com if you have any more questions or need any help.