I am running into an issue. I have purchased a domain from Cloudflare registrar, now I just want to point the domain to my CDN managed DNS, they have provided me their nameservers. Where in Cloudflare should I make changes.
You can’t - domains purchased with Cloudflare Registrar can only use Cloudflare nameservers.
Registrant agrees to use Cloudflare’s nameservers. REGISTRANT ACKNOWLEDGES AND AGREES THAT IT MAY NOT CHANGE THE NAMESERVERS ON THE REGISTRAR SERVICES, AND THAT IT MUST TRANSFER TO A THIRD PARTY REGISTRAR IF IT WISHES TO CHANGE NAMESERVERS.
You’ll need to get an IP or domain to point to using A/CNAME records or transfer out to another registrar if they won’t let you do anything but use their nameservers.