You can do it in many ways. But before writing or calling, please go through the MTTS FAQ at this link.
The best possible way is to send an email to mttsprogramme at gmail.com OR kumaresa AT gmail DOT com.
Any questions or queries related to the website should be send to the email address mttsonlineservices at gmail DOT com.
If you prefer the traditional way of sending posts, please write to
Prof. S. Kumaresan
Programme Director, MTTS
School of Mathematics and Statistics
University of Hyderabad
P.O. Central University
Hyderabad 500 046