How to change my username in irctc co in user account

Dear Sir,

Yesterday, I had changed mobile nos in my User I/d- Svignesh, but didnot change email address.
Now, while login it asks for password. With old password I am not able to assess the login.

The old mail is also inactive. Hence , I request you to direct the password etc, that has been sent
to old mail.
My new email is shankarnarayanan60@gmail.com.

Please help me out.

Regards

R.R SHANKARNARAYANAN
MOB.07878051969