How to remove Meta name generator

Hi, apkajanu!

Try to place this code into functions.php:

//remove trash from source
add_action('get_header', 'start_ob');
add_action('wp_head', 'end_ob', 999);

function start_ob() {
	ob_start('remove_trash');
}
function end_ob() {
	ob_end_flush();
}

function remove_trash($output) {

	if (defined('CUSTOM_LOGIN_VERSION')) {
		$target = '<meta name="generator" content="Custom Login v' . CUSTOM_LOGIN_VERSION . '" />';

		$output = str_ireplace($target, '', $output);
		$output = trim($output);
		$output = preg_replace('/^[ \t]*[\r\n]+/m', '', $output);
	}

	return $output;
}