Tnvelaivaaippu.gov.in — Ask for Caste name section enable

Sir/Madam,
My self Kalidas V USER ID : SGD2015M00012275 . When i was trying to add my degree qualification... It shows validate as "Please enter the CASTE".. But that field is not visible that is disabled... PLEASE LOOK AT MY CASTE AND CHANGE IN IT FROM YOUR END...
Community : BC
Caste : YADHAVA(including idaiyar)

Kindly resolve this issue.

Thanking you sir/madam...