Link: https://mailchimp.com/features/domains
Quick steps who need help -
  1. Register from that signup button. (Use genuine working email id)
  2. Verify email.
  3. Create account.
  4. Fill all details, provide address as well.
  5. Once profile is done and you logged in, goto - "Create" in top -> "website" -> "Purchase domain" -> find and just checkout.
  6. Easy right
Yukarıdakileri uyguladığınız zaman 5 yıllık bedava .com domain kayıt etmiş oluyorsunuz