What is the name of the domain?
example.tr
What is the issue you’re encountering
.tr is a new TLD. I’ve added that domain and try to link pages. But on dns verification page it gives following. I guess it’s not added.
May I ask if the .tr domain was possibly recently registered and become an active domain? 
By the WHOIS, domain was registered recently.
Could be the zone was out of any DNS record and added to your Cloudflare account?
Have you re-tried the process again later or tried using a different Web browser?
Could be it was related due to the recent Dashboard / API incident from the status page as well:
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