You can order Ancyast Dns at link below :
https://my.blazingfast.io/cart/dns/
After that click to "I will update the nameservers on my existing domain" and enter your domain name (in example - it "qwe123.com") and click tt "Continue:
In next step click to "Continue".
Final step - click to "Checkout" :
Congratulations, you can now add domains to any Dns.