Inbox is a Qontak Omnichannel feature where customer service will serve all user complaints in the form of chat that goes into the Inbox.
To receive messages, your Omnichannel status must be Online. Here's how to enable status on Omnichannel.
Login to http://chat.qontak.com/ in your browser (Safari, Chrome, or Firefox) on your computer.
You can change the offline/online status by sliding the tool like in the image located in the upper right corner.