You will need to add that domain from the “Subdomains” section of the Control Panel this time, and upload your website files on yourdomain/htdocs with an FTP client, replacing yourdomain with your domain.
Also, for the SSL handshake error, you will have to change the SSL option from “Full” to “Flexible” on the “SSL/TLS” page of the Cloudflare dashboard for your domain, and change the URL of your WordPress from HTTPS to HTTP by following this guide, posted on another article before: