This is easy & good tutorial to change password & email ID when you forget or your representative is not giving these information.
I changed mine email ID and Password by using this tutorial.
Instrcutions:
1 Please login with internet banking to your account registered with incometaxindiaefiling.gov.in.
2 Now in SBI left hand a link is given "Login to e-filing" click on it.
3 A high security password come to mobile; eneter it.
4 Now they will confirm pan number & some instructions Click Confirm.
5 Now next page will be your incometaxindiaefiling.gov.in profile will open
6 Here you can change every details from email-ID to password & secret hints answer.
https://www.youtube.com/watch?v=MtpKi2_PCgQ
Enjoy