Gary,
Just look right below where you add the text for your posts, click the browse tab and then find the picture you want to add on your computer. After the destination (on your computer) shows up in the attach field all you have to do after completing the text portion is hit post.
There are restrictions: a) file size cannot be any bigger than 2200 KB or 2.2 MB, you can tell this by placing your cursor over the picture file, a properties window will pop up telling you the file size, or you can just pick the "LIST" option under "View" at the top when you're in the folder with the picture to give you the file size. Also, b) many programs save pictures as bmp files, which I believe you have sent me via PM, these need to be changed to jpg, or jpeg to be able to post since the site doesn't accept bmp picture files.