Hi,
1. The date is displayed with that line:
<?php echo JText::sprintf('DATE_ON_WEBSITE',hikashop_getDate(time(),'%Y-%m-%d %H:%M'),HIKASHOP_LIVE);?>
You can also override the DATE_ON_WEBSITE key in your translation file:
www.hikashop.com/en/download/languages.html#modify
2. HikaShop doesn't have the name of the user as it's joomla which stores it. If you don't have registration, there is no joomla user information, so no name available.
You sure have the name of the address, but that doesn't mean that it's the name of the user all the time.
You can do that if you want to use the address name:
www.hikashop.com/fr/forum/4-how-to/19958...appear-on-email.html