The first thing to do when you access the forum is set your user options. To do this click on the Options button at the top of the page. You will see a list of available forums on the left side of the page; check the forums you would like to display. When a new forum is added you must select it from this options screen in order to see it.
Select the "Email Notification From Marked Threads" option to receive an email notification each time a user posts to a thread you have marked. Threads can be marked by simply clicking on the small button to the left of the thread subject. You will also need to enter your email address in the "Personal Email" box. Doing this will automatically include your valid email address in any posting you submit. You will have the option to notify other users in a thread when you reply to a posting.
The "Listed Threads" option is also important as it defaults to today which means you will only see the current days threads listed when you initially access the forum (you can still search through old threads though). You may wish to leave it set to Today, but keep in mind that any threads you create today will not display tomorrow unless you change the option to Last 2 Days.
Most of the other options are user specific and depend on your tastes in displaying the data.