If you're able to access your Vocal account, you can change your email address right from your Settings page.
If you need to change your email address in order to access your account, you can get in touch with us here and we can help you out. Just be aware that in order for us to change any of your personal info, you will be required to verify your existing email address on the account. Otherwise, if you're not able to provide adequate verification, we're not able to make any changes to the account.