To post a picture in this thread:
If the picture is already online
(this website, or another):
1) Click the "insert image" button. (2nd from the right in the quick reply box. It looks like a yellow sky with mountains.)
2) Enter the website address of the photo.
If the picture is NOT online
1) Click the "go advanced" button.
2) Click the "attach file" icon. It looks like a paper clip, and is located next to the smiley face. (3rd icon from the right.)
3) Upload the files from your computer.
If this still doesn't allow you to post a picture, there are more detailed instructions on Mistersmom's "How to For Newbies: Insert a Picture"