Error with eu.org domain

I’m trying to use the phsldev.eu.org domain, can you tell me if it’s possible? And how, the error says that the domain does not exist

Are you trying to add to the registar section or to be used with Cloudflare ?

To be used in CloudFlare, I think I found the error, for some reason the dns that was in the domain is off, I’m going to change and test

I put an Ifastnet server that I had here, I’ll wait until a little later and test it, but I think that’s it