@msolga,
1) Go to "My Topics", top of any page, and sort by "New Topics" or "New Posts". That should bring up the topic you're talking about.
2) To post an image; it's actually not much different than it was before. Open reply, click "Enable BBCode Editor" (green link just above the reply box), click
Img and you'll get the following:
Code:[img][/img]
Just paste the image link between the ] and the [ .
Or you can paste in the image link, then highlight it in the reply box and click
Img. I just tried both methods and they both work.