Now that we have a thread for this, I can walk you thru it.
1. Click on "Post Reply" in the top left of this screen.
2. The reply window should open.
3. Scroll down to "Manage Attachments"
4. In the new screen that comes up, click on "Browse" in the first line of the attachments window.
5. Browse to the picture you want to upload and select it.
6. You should see writing in the first line of the attachment window now.
7. CLICK ON THE BUTTON THAT SAYS "UPLOAD".
8. Now you should see the filename at the bottom of your attachments screen. It will say "Current attachments".
9. Now you can write your post and click submit.
Let me know how it goes for you.