@ndiagait doesnt, work. I tried to change the file at modules >> contact form >> templates >> widgets
That too didnt work. Even the label does not get changed from 'optional' to 'required'.
It seems it also requires a change in the contactform.php file. I tried to add the validation in the .php file but that didnt work either.
Do I need to do anything else after modifying the files?? Please help.