The premium version of the plugin allows users to send messages to the shop admin thanks to a specific form shown in sidebars. To add the form, use the widget “YITH Membership”.
The admin can answer messages sent by users in the dedicated section in WordPress dashboard: Membership > Messages.
Click on the username and reply to the question.
Conversations are sorted according to the last answer given. To check for new messages, ensure that the last message shown is not you, shop admin.
The shop admin can send a message to a member any time, by simply clicking on the button “Send Message”, available in WordPress list of users.