Hi,
You can use the contact form or use the private message system.
Under the profile avatar (and the number of message) you will see a little "message" icon which will allow you to send a private message to another user.
( Please note that during the week end, some people of the support team are not available. )
Kind 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.