please, do post a pic! It's very easy - click "reply" at the bottom of the last post. Type your comments in the white box. Under that, you will see 3 white rectangles with the words "file attachments" above them. Click on the "Browse" button, and it will open a window that shows the contents of your computer. Go to where your pictures are stored, click on the picture you want to show, and click "open" (or just double-click). Then click "Send" and your picture will post!
Just make sure it's not huge - usually I try to keep them smaller than 1M.