Please click on the reset password button on your homepage. The email will then be re-sent to you immediately, and it should show up in your inbox (or possibly spam folder) no later than 10 minutes after the request. 

Make sure that you have checked all your email accounts (any official institutional email addresses as well as your private email address). If the email does not arrive within 10 minutes, take a look at this article for more guidance on how to reset your password.

In case these issues persist, please contact the admission office of the graduate school you are applying to.