How to modify my password on my current account?

I need to reinitiate my password on my current account sunshine16@videotron.ca but because I have changed of supplier, when the system sent an email to reinitiate the password because it has been desactivated by the company, I am not able to indicate another email address and cannot access to my account.  Could you please help me?  My new account is dreamsun16@hotmail.com. Thanks Have a great day