[Plugin: Private BuddyPress] Custom Login Page

Love the idea of this plugin! How do we set a custom login page (not wp-login.php)?

We were using this from the WordPress Codex. Guessing we need to edit private-buddypress.php here:

// Redirect to login page if for current page a [?] is required
			elseif ( $this->LoginRequired() ):
				$loginPage = apply_filters('pbp_redirect_login_page', get_option('siteurl') . '/wp-login.php?redirect_to=' . $redirect_to, $redirect_to);
				wp_redirect($loginPage);
				exit;
			endif;
		endif;

What is the best way to do it? Many thanks for help!

https://www.ads-software.com/extend/plugins/private-buddypress/