How to attach the zao subdomain to the Russian-language domain?

Question

Domain Name System

Sunlit.rf domain, bought on reg.ru
Website hosted on heroku.com
How to do two things:
1. Be able to visit the site at sunlit.rf (not www.sunlit.rf) (heroku says to use clowdlare) 2. Be able to access the site
at
zao.sanlit.rf

Answer 1

In this configuration, it makes no sense for you to configure CloudFlare, because ns records are set to DNS reg.ru. Therefore, first you need to change "eneski" to cloudflare (or leave it as it is and start all dns records on reg.ru).
Regarding heroku.com, they have instructions here: https://devcenter.heroku.com/articles/custom-domains