/** Diable User Registration Link in WP-Admin */
add_filter( 'register', 'jnews_remove_registration_link' );

function jnews_remove_registration_link( $registration_url ) {
	return __( 'Manual registration is disabled in this page.', 'jnews' );
}

/** Diable User Registration in WP-Admin */
add_action( 'init', 'jnews_redirect_registration_page' );

function jnews_redirect_registration_page() {
	if ( isset( $_GET['action'] ) && $_GET['action'] == 'register' ) {
		ob_start();
		wp_redirect( wp_login_url() );
		ob_clean();
	}
}