If you're looking on the mu-43 home page, the right side of the page highlights the most recently active discussion threads. Next to each one, you may see status icons, which can be helpful in navigation. For example, if there are new posts in a thread which you have not yet seen, you will see a on the left of the thread title. Clicking on this will take you to the first new post. A to the right of the thread title indicates a thread to which you are subscribed. Unless you have changed your user settings, you will be subscribed to all threads in which you have participated. Here's an example of how it looks:
