Click on the green square next to the thread title. This will take you to your first unread post
@Ike582, here's another handy tip that it took me months to learn. If you've replied to a thread and you're interested in keeping up with it, you can check the "Replies" menu item at the top to see which threads you've replied to have had recent activity. Very handy feature, especially if you've been away for a few days. Myron
The color of the image depends on the theme in use
And despite putting it there myself, I still tried to tap it.