Stateside, many drug stores (chemists?) have photo processing desks, equipped with connectors to hook up to most any type of digital camera, allowing you to create CD's or memory sticks of pictures, or they can be e-mailed to you by the store. I'd assume a similar service is available near you.
Once you get the picture(s) home, pop the disk into your PC. When you post here, select the "Additional Options" link in the posting window. This will open an "Attach" window. Click "Browse", find the picture file and upload it. That's all there is to it.