You must click on the button (it may say Browse, Search or similar depending on your operating system) to find the images on your PC. Once you have found the image click the "Upload this Image" button. The first photo you upload will be the main image for your listing.
When an image has uploaded successfully it will appear above. Images may take a few minutes to upload depending on their size and also your Internet connection speed.
Repeat these steps to upload other images one by one.
When all the images have uploaded successfully they will replace the boxes "No Image Uploaded"