Unfortunately, you can't upload your pictures directly to this website. The best thing to do is to upload it to a website such as the one that your ISP may provide to you. Otherwise, you could find a free one or a commericial one and upload it there. I don't use external websites so I can't offer a suggestion.
If you are a member of reefcentral, you can upload your pic there and then link it here as well.
For example,
I'm not 100% what their user agreement is about this because it does use up their bandwidth when an external site accesses it. They would probably frown upon it which is why I use my own website. However, this is just for demonstration purposes.
