Hot to set up zone files, DNS for a domain registered at gandi.net for heroku app

Question

So I have hard time understanding what exactly I should do as most of the posts about this topic seem to be outdated because of some changes(?) heroku made. Currently I have everything set up according to all instructions I could find but still, when I go to mydomain.gg or www.mydomain.gg I get default gandi page stating that the domain has been registered at gandi.net.

Do I need to change my DNS servers which currently point to gandis servers? Also here's my zone file. The first line was automatically added for redirecting to www, I think.

@ 10800 IN A 217.70.184.38
www 10800 IN CNAME myapp.herokuapp.com

And here's my redirection set up:

Or maybe everything is

Answer 1

@ 10800 IN A 217.70.184.38
www 10800 IN CNAME myapp.herokuapp.com.

Seems I was missing dot at the very end of the second line which made it interpret as a subdomain of my main domain.