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Underneath each product, there is a Product Question tab. A customer or guest can leave contact information and question. Customer can tick Private Question, this means visible to admin only or public( visible on product detail page) and click Ask Question button. Question is sent successfully. After customer having sent successfully, customer going to be waited to approve by admin.
Admin can view and manage customer's questions. Admin goes to the back-end, click on Marketing-> Manage question. Choose question to answer ->action->change status->enable.
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