At the bottom of the page, under the gray box which shows who is online there are 3 links listed. If you click on Subscribe Topic, you will get an email letting you know when someone replies on that thread. I usually subscribe to threads I have started or to ones that I have a particular interest in. You can unsubscribe whenever you want. The Bookmark link is also very helpful. When you bookmark a thread you can find that particular thread easily by going to your User Control Panel and choosing Manage Bookmarks from the list of options. Just click on the thread you want from the list presented and your there. You can delete a bookmark whenever you want. I generally bookmark the threads I have started for my different projects or ones that have a particular interest for me that I may want to reference later.
We were all new to forums once. You can't do any harm so "click away" and feel free to explore and to ask any questions you may have.