In the sidebar on the WordPress dashboard, you will find the Forums, Topics, and Replies links. Forums is where you can create and manage your individual forums. Forums are like parent containers that hold topics on a specific subject. The individual forum posts will then populate in the Topics section, and replies to the specific topics will populate in Replies.
Generally, all forum pages are dynamically generated from the slug set in the Forum Settings, and the forums, topics and replies created, but if you want, you can add the forums by using a shortcode. See the bbPress codex for a full list of shortcodes if you want to do this sort of thing. The benefit of this approach is that you then have the possibility of designing the forum page to add other elements. See the eSports Forum page for an example of this.
There are other helpful Elements as well when building a forum. Fusion Builder Elements, like the User Register, User Login and User Lost Password can be used throughout your layout to assist users to become part of your community.