What should I do? Then How can I apply for this course?

You can email them or ask them by calling the authority. Because the link which I have given you is the genuine website

Can I take admission by online? Do you know the procedures?

It is not possible to get admission here online but you can go to the Maduari Kamaraj University by yourself and can buy prospectus and Application form then you can send it as demand draft. I am providing you the link where you can see it by yourself.
http://mkudde.org/app.php

The adress is also mention in this link.
This will help you

Is it possible to send filled application form to MK university by post for admission? Because university is far away from my hometown..

You can send it by post but to get the fork you have to go to the university. Go there tell your query to the office staff they will guide you. Atleast go there once.