how to use user inbox?

-- HikaShop version -- : 2.6.3
-- Joomla version -- : 3.4.3
-- PHP version -- : 5.5
-- Error-message(debug-mod must be tuned on) -- : none

hi

does hikamarket have an inbox?

what if buyers have a question for the vendors?

question for the store owner?

thanks

thanks jerome