Testing for the unread dot indicator.
Yes, I want to know how the unread indicator is shown when posts are unread.
Hey @Dalok, welcome to Meta 
Please use try.discourse.org for testing next time.
Is there a specific unread indicator you are interested in? On topic lists like /latest there is the small dot for new topics and the dot with the number of new posts on topics you have already looked at. And there is also a dot in the sidebar next to the category and “Topics”.
By default, new topics are those created in the past 2 days. You can change that in your preferences with the “consider topics new when” setting.
You will see a count with the number of unread posts on topics you are tracking or watching. At the same place where you can configure how long topics are new, you can also choose when you will track topics based on your reading and posting behavior. You can also watch/track topics in specific categories or with specific tags by default and manually change the notification levels of each topic.
Some time ago there was also a short explanation on the /new and /unread pages. Maybe that’s also helpful for you.