This is a message board. All the text you see is stored on the SDMB database, and for a variety of very important reasons the Powers that Be don’t allow you to store images on the database. They’re very, very large compared to text, people have abused this in the past, and mainly, this board it about words and ideas, not pictures.
If the picture is online, you can place a link to the image in your post. The mods have turned off the ability to have that image show up as a picture in the middle of your post because of past abuse and because this message board is about words and ideas, not pictures. But a link to the image can still illustrate any point you are trying to make.
It’s not hard to get an image on the web, you can use webshots.com or any one of hundreds of free image hosting sites.