The inbox feature allows you to send direct messages to app users. The app users will then be able to respond to these messages.
Send a Message
Once you have added the feature to the app, click on + to send a message:
Then select the fields you want to add to the message and fill these in:
You can then choose to send it on a specific date, choose the users/select all users and finally, choose to send a push notification with the message:
You can manage and answer your messages here: