there are some problems with my name server 
Well, you have set invalid nameservers. You need to set nameservers which respond for your domain.
If you then want to add your domain to Cloudflare, you can certainly do so, but you first need valid nameservers.
how to get valid nameservers?
That’s a question for your host, Cloudflare will not provide nameservers until you added the domain.
oh well, thanks a lot for the help 
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