On the posts page, you'll find a container box titled 'Related Topics'. The container will have 5 recent threads from the board you are looking at and you'll be able to click on the links to go directly to that thread. A means there are new posts in that thread. A means there may be new posts in that thread but there wasn't when you started browsing the current thread.
On the bottom there are new short-cut buttons to the home page, the thread list, the previous thread and the next thread.