BP_Forums_Component::setup_nav( $main_nav = array(),  $sub_nav = array() )

    public function setup_nav( $main_nav = array(), $sub_nav = array() ) {

        // Stop if there is no user displayed or logged in
        if ( !is_user_logged_in() && !bp_displayed_user_id() )
            return;

        // Define local variable(s)
        $user_domain = '';

        // Add 'Forums' to the main navigation
        $main_nav = array(
            'name'                => __( 'Forums', 'buddyboss' ),
            'slug'                => $this->slug,
            'position'            => 80,
            'screen_function'     => 'bbp_member_forums_screen_topics',
            'default_subnav_slug' => bbp_get_topic_archive_slug(),
            'item_css_id'         => $this->id
        );

        // Determine user to use
        if ( bp_displayed_user_id() )
            $user_domain = bp_displayed_user_domain();
        elseif ( bp_loggedin_user_domain() )
            $user_domain = bp_loggedin_user_domain();
        else
            return;

        // User link
        $forums_link = trailingslashit( $user_domain . $this->slug );

        // Topics started
        $sub_nav[] = array(
            'name'            => __( 'My Discussions', 'buddyboss' ),
            'slug'            => bbp_get_topic_archive_slug(),
            'parent_url'      => $forums_link,
            'parent_slug'     => $this->slug,
            'screen_function' => 'bbp_member_forums_screen_topics',
            'position'        => 20,
            'item_css_id'     => 'topics'
        );

        // Replies to topics
        $sub_nav[] = array(
            'name'            => __( 'My Replies', 'buddyboss' ),
            'slug'            => bbp_get_reply_archive_slug(),
            'parent_url'      => $forums_link,
            'parent_slug'     => $this->slug,
            'screen_function' => 'bbp_member_forums_screen_replies',
            'position'        => 40,
            'item_css_id'     => 'replies'
        );

        // Favorite topics
        $sub_nav[] = array(
            'name'            => __( 'My Favorites', 'buddyboss' ),
            'slug'            => bbp_get_user_favorites_slug(),
            'parent_url'      => $forums_link,
            'parent_slug'     => $this->slug,
            'screen_function' => 'bbp_member_forums_screen_favorites',
            'position'        => 60,
            'item_css_id'     => 'favorites'
        );

        // Subscribed topics (my profile only)
        if ( bp_is_my_profile() ) {
            $sub_nav[] = array(
                'name'            => __( 'Subscriptions', 'buddyboss' ),
                'slug'            => bbp_get_user_subscriptions_slug(),
                'parent_url'      => $forums_link,
                'parent_slug'     => $this->slug,
                'screen_function' => 'bbp_member_forums_screen_subscriptions',
                'position'        => 60,
                'item_css_id'     => 'subscriptions'
            );
        }

        parent::setup_nav( $main_nav, $sub_nav );
    }