Trying to Install a custom certificate but do not know how to create a chain

Alright I think I am missing the point as well. I was under the impression that if I couldn’t have my nameservers here at Netlify I couldn’t have a certificate provisioned by Let’s Encrypt. I added the A record and www record that was mentioned in this article

I see this after doing so

It says “We’re ready to provision a TLS certificate from Let’s Encrypt and install it on our CDN.”

Then I get this:

I’ll wait the 24 hours suggested in the guide.

Sorry for misunderstanding, web dev is new to me and I am learning.