Once you are in the Location Details page, select the Location Photos sub-menu.
In the Images field, select the checkboxes below the photos that you wish to delete. Each image that is selected is highlighted with a green box. When you have selected all of the images that you want to delete, click on one of the Actions buttons on the right-hand side of the Images field. Select Delete Selected from the drop-down menu.
A pop-up box will appear to ask you to confirm the deletion. Click Yes to delete the images from your location file.