Allow registration

Can i allow registration or a specific url so people can register?

I have tryied this code i found in the forum but it doesnt help.

add_action( 'parse_request', 'dmk_redirect_to_login_if_not_logged_in', 1 );
/**
 * Redirects a user to the login page if not logged in.
 * Added is_page() conditional
 *
 * @author Daan Kortenbach
 */
function dmk_redirect_to_login_if_not_logged_in() {

	// If on this page, do not redirect
	if ( is_page( 'change-me-to-page-slug' ) )
		return;

	// If on this post, do not redirect
	if ( is_single( 'change-me-to-post-slug' ) )
		return;

	// Conditional(s) above were false, redirect
	is_user_logged_in() || auth_redirect();
}