To change the email address or the password for your account, you need to log in to your account online.
Once you have logged in, go to My profile → Change login. Here, you will see the options to change your email address or password. If you change the email address, a validation email will be sent o the new one to confirm the change.
Once you have changed the email or password for your account, don´t forget to log out of Mailify and log in with your new details.