Marta,
posting photos in-line is a bit difficult but not impossible. Go to the FAQ and see what they say about how to post an image. You need to have it on a site that the server can point to: like Pbase for example. Then you need to copy the URL into the pop-up and make sure to have a file extension: .jpg at the end of the file number. That's all there is to it.

Give it a try. As I said, it's cumbersome but not impossible.

Jim