Where do you have the photos hosted? What did you try? Post just the URL where a photo is hosted and let me try to make it show up. Then we can determine if it is the host site or your computer or maybe the method you are using (or just some mean Gremlin in the system).
First the photos must be stored on the web and have a static web address or URL (first class members can use storage provided by MLS). Then the photo can be posted here by iusing the familiar image tags [*img]URL[*/img] (without the stars of course). First Class members do get advantage of some extra features in that regard.