The theme allows you to add forums functionality to your site.
Forums require the bbPress plugin to work. The plugin is available for free in wordpress.org repository. You can download it or install directly from the WP admin panel › Plugins › Add new panel.
The BuddyPress is one of the most popular WordPress plugins so you will easily find a lot of useful tutorials about it.
Official page: bbPress
By default, after plugin activation, the forums index page is
http://your-domain.com/forums/. To change that,
please visit plugin's settings page (see below).
All bbPress settings are available under the WP admin panel › Settings › Forums page.