Hello there. Hope you are doing good. I would like to tell you that the login credentials are sent over mail only and also other updates such as release of admit card and necessary instructions regarding the exam. You can mail your concern to the admissions department of the SNAP exam and you can request them to rectify the email address you have provided. However, the chances are less to get the email id changed as such cases require you to fill a new form. Still, you can hope for the best and expect a positive response from the admissions department.

I hope you found this answer helpful. Good luck for your future.