If you choose any special or normal trains when the page will be open see bellow of the name there are some icons click on the TT update and now you can change TT from railways officiall website or Any PR
please wait...Translate to HindiAgar tu koi special ya normal train choose karta hai toh jab page khulega, naam ke neeche kuch icons honge. Wahaan par TT update par click kar aur ab tu railways ke official website ya kisi PR se TT change kar sakta hai.