Hi,
In HikaShop there is an option "Display a contact button on the product page" in "System > Configuration > Display > General display options".
Set the option to "On a per product basis" and save your configuration.
After that, you can configure for each product, if you want to add a contact button for the product.
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.