Messages go to the person who maintains the site. There is no email address to copy and no account to create: the form sends your text and the page you sent it from, and nothing else. Please do not include your name or birth date — the calculator runs in your browser, so a message cannot be checked against the numbers you saw.
Useful reports say what you typed, what the page showed, and what you expected under the rules on How we calculate. A page address helps; a screenshot is fine if it contains no personal details.