If you don't remember the email address you registered on the site, simply send an email to atendimento@mundoticket.zendesk.com with your CPF (which must be the same one used when registering).
Alternatively, you can contact us via the "Help" button on our help center: https://mundoticket.zendesk.com/hc/pt-br
Our support team will then look up the email address registered to your account.