Log in to your domain registrar's control panel to add a CNAME record that points your new subdomain to the Heroku-provided DNS target. Log in to your domain registrar's control panel to add a CNAME record that points your new subdomain to the Heroku-provided DNS target. Log in to your domain registrar's control panel to add a CNAME record that points your new subdomain to the Heroku-provided DNS target. Log in to your domain registrar's control panel to add a CNAME record that points your new subdomain to the Heroku-provided DNS target.