If you order a domain validation SSL certificate, you provide the e-mail address on which you wish to receive the validation e-mail during the order procedure. This e-mail contains a link you must click before the SSL certificate is issued.
If you wish to change the e-mail address on which you receive this validation e-mail or wish to have the validation e-mail resent, you can request this via your customer panel. This is entirely free of charge.
How does this work?
Login to your customer panel, click 'Your SSL certificates' on your left, and then click 'Overview'. Click the magnifying glass behind the relevant SSL certificate and then click 'Change approver e-mail address' at the top. This is only possible if the SSL certificate has not yet been issued.