How do I SSH? 

Cloudflare only proxies HTTP traffic. If you need to connect to your origin using another protocol (SSH, FTP, SMTP, etc.) you need to do so using a record that does not have Cloudflare enabled in the DNS settings (grey cloud) or by connecting directly to the origin server’s IP address.

Examples:

$ user@ssh.example.com

$ user@1.2.3.4