If you are using CloudFlare, you can setup your domain hosted with us to include SSL or disable SSL. In general since your clients connect directly to CloudFlare, enabling SSL on CloudFlare's end is enough to have SSL for your website.
From the CloudFlare SSL settings, please select one of the following 2 options:
Flexible: secure connection between your visitor and Cloudflare, but not between Cloudflare and your web server. You don't need to have an SSL certificate on your account, but your visitors still see the site as being HTTPS enabled.
Full Strict: secure connection between the visitor and Cloudflare, and secure and authenticated connection between Cloudflare and your web server. You will need to have your server configured to answer HTTPS connections, with a valid SSL certificate.
If you have a Let's Encrypt certificate installed already (All of our Free SSL are based on Let's Encrypt) and configured for your website, we would recommend that you select the Full Strict option. Let's Encrypt certificates are renewed automatically, so that's the best option in this case.