Hi,
You do not need to paste the view code here, don't worry, we already have it
Order custom fields are only accessible in HikaShop business and regarding your account, you do not have it.
I guess that's why you can't add additional information during checkout, because it's a feature of the commercial version.
Please test the custom fields in our demo website
demo.hikashop.com/administrator/
Regards,
Jerome - Obsidev.com
HikaMarket & HikaSerial developer / HikaShop core dev team.
Also helping the HikaShop support team when having some time or couldn't sleep.
By the way, do not send me private message, use the "contact us" form instead.