As long as you remember/have access to your password, you can simply log in to your account and change the email address, even if the email address no longer exists or you yourself cannot access it.

However, if you no longer remember the password and you no longer have access to the registered email (where your login details are sent when you request them), the only option is to register a new account and start over again.

So remember to always keep your contact information on your account updated, and preferably use an email address that you won't lose access to! It's best to avoid using an email from your school or current employer 😊