Hello,
1 - Please re-download HikaShop
Someone else submit an issue which can be the same as yours but since he provided more details about the details and a link to the source of the issue, we were able to investigate correctly on it.
2 - If the problem persist, please provide a directly to where your issue is, with precise instructions to reproduce your problem.
Please note that when I went in your website homepage, there was nothing to guide me ; so I opened a product page manually and I was able to add it into the cart by filling the required fields.
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.