Discussion posts are great medium of communication when it comes to clearing the doubts of the learners. And as a teacher you can take part and answer the queries posted by the learners or clear their doubt. To do so, just follow the steps mentioned below,
Log in to your admin account and click on Manage from admin dashboard
From the drop down select Discussion
Click on the particular question from the list
In the new window click on Reply
Now fill out your answer and click on Reply again on the pop up screen
And your reply will be added and the learner will get an email notification