Adding SSL support for your web site involves verifying that you are the owner of the domain. This is done by sending a verification mail to an email address that is associated with the web site domain.
In some cases, the email addresses in the list provided to you may not be active or may not be monitored by you. In that case you will need to associate a new email address with your domain in order to continue the setup process.
Associating a new email address with your domain is done through your domain registrar and you should contact your domain registrar support team. If you encounter any problems in this process please open a ticket with our support team and we will do our best to assist.