You can edit current listings by clicking the Actions button below it and selecting Edit. This will bring up the Add/Edit Listing modal. Here there are three tabs you may use to edit: Info, Images & Upload Images.
Info tab: On this tab in the modal you can adjust any of the information or details about the listing.
Images tab: This is where you choose the primary image that will be associated with this listing. Primary image is used for emails, social posts, and display in the library.
Upload Image tab: If you wish to add more images for this listing, which can be used as primary images as well, select this tab and choose images from your computer.