to post pictures, click the "go advanced" button below the typing box. after that, look above the text box, there should be a little paper clip icon. click on that and a little window should pop up. click the "browse" button and it will allow you to upload files from your computer. once you find the image you're looking for, click the "upload" button. It should take a few minutes to load. once it's done loading, click on the paper clip again. there will be a little bar below it saying the file name. click on it. in your text box, there will appear a little thing that looks like this: [attach/]IMG.*****JPG.[attach/] (these * will be the file/image name) this will translate as your image. once you post, the image should be there.
Hope this helps, ~Saphira