Hi,
If you have a full blank page it indicates that you have a PHP fatal error.
First, be sure to have latest HikaShop 3.0 package.
If problem persist, please check your PHP error log or display error messages via "error reporting level" of your Joomla global settings.
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.