Can't add domain name

Hi,
I have a valid domain “trackmycar.lk” but I can’t add this domain to cloudfare account. I haven’t add nameservers to the domain, I have pointed my domain directly to my server ip. (by A record)

How can I add this domain?

Thanks.

What does that mean? You cant point a domain without nameservers.

Anyhow, though, you first need to point your domain to nameservers, which answer for it, before you can add it to Cloudflare.