No access to account

I am a legal entity of a dental clinic, we would like to change the DNS address of our website, but we cannot contact the person who registered the account, what should I do?

Is Cloudflare the Registrar for the domain? Or is the domain registered with another registrar, but configured to use Cloudflare’s services?

If you aren’t sure, kindly share the domain in question so we can dig a little deeper and let you know your options.