I take it you have the pictures already and you are just wondering how to upload them? Well I'm going to assume that is the case and explain to you the uploading process.
When you begin a new topic or when you hit the "reply to topic" button at the top of a topic, you should be taken to a page where you can type in all you want to type etc etc... at the top left hand corner of the page, you should see a little picture of a paperclip, click on that picture and it then allows you to browse your computer for the picture you want to upload and then click upload and your done. Keep it in mind that certain filr types are not accepted by the system, so if the picture you are trying to upload is .bmp then you must save it as a .jpeg. I'm not sure exactly which file extensions are accepted, but I do know that the .bmp extension is not accepted.