How to remove mandatory field in the form?

Plz tell me what to change in the code below the fields (Organization, contact person, City, Communication) was optional.
Code in Studio

<?if (!isset($_SERVER['HTTP_X_REQUESTED_WITH']) || empty($_SERVER['HTTP_X_REQUESTED_WITH']) || strtolower($_SERVER['HTTP_X_REQUESTED_WITH']) != 'xmlhttprequest') {require($_SERVER['DOCUMENT_ROOT'] . '/bitrix/modules/main/include/prolog_before.php');$APPLICATION->SetTitle("); global $USER; if ($USER->isAdmin() ) { require($_SERVER["DOCUMENT_ROOT"] . "/bitrix/header.php"); } else { LocalRedirect(SITE_DIR); die(); } } define('NO_AGENT_CHECK', true); define("STOP_STATISTICS", true); require($_SERVER['DOCUMENT_ROOT'] . '/bitrix/modules/main/include/prolog_before.php'); ?><?if (!isset($_SERVER['HTTP_X_REQUESTED_WITH']) || empty($_SERVER['HTTP_X_REQUESTED_WITH']) || strtolower($_SERVER['HTTP_X_REQUESTED_WITH']) != 'xmlhttprequest') {require($_SERVER['DOCUMENT_ROOT'] . '/bitrix/modules/main/include/prolog_before.php');global $USER;if ($USER->isAdmin() ) { require($_SERVER["DOCUMENT_ROOT"] . "/bitrix/header.php"); } else { LocalRedirect(SITE_DIR); die(); } } define('NO_AGENT_CHECK', true); define("STOP_STATISTICS", true); require($_SERVER['DOCUMENT_ROOT'] . '/bitrix/modules/main/include/prolog_before.php'); ?> To order a calculation of equipmentOrganization:*Phone:*Contact person:*City:*E-mail:*The message:*Please note!  If You have a specification, please attach a file or an archive file.To attach a fileThe file is loaded...

<?if (!isset($_SERVER['HTTP_X_REQUESTED_WITH']) || empty($_SERVER['HTTP_X_REQUESTED_WITH']) || strtolower($_SERVER['HTTP_X_REQUESTED_WITH']) != 'xmlhttprequest') {global $USER;if ($USER->isAdmin() ) {require($_SERVER["DOCUMENT_ROOT"] . "/bitrix/footer.php");}}