I am not sure if DEMOs have this, but S2s do. Click on "Post Reply". To the right of the
which is right of the A, and left of the left arrow, there should be a paperclip. Click on that, and browse for your pictures. I'd make sure that the size of the pictures not be too big. I believe you get 2 MiBs of pictures (format). The second option would be to upload them to a picture hosting site like http://imageshack.us/
and posting the links in your next reply.
BTW, refrain from double posting too much, unless you have necessary unique information. The EDIT button is a wonderful invention, and should be made to make minor changes to a post.