Dear Mr. Arasu,
In the course website there is a link "Participants" , if you click on it, it will show you the list of all participants of this course. Click on the name of a participant to know more details about him/her.
There is another link "Online users", it shows you the names of the participants who are online, You can message them or chat with them.
All the best.
Dattakumar Chaskar