Custom domains on heroku: Lost at setting Hostname/IP Address stage

I know custom domains on heroku comes up a lot but I'm lost.

The registrar wants t开发者_开发知识库his information specified:

Primary Nameserver
Nameserver:  
IP Address: 
Secondary Nameserver
Nameserver:  
IP Address: 
Extra Nameservers (Optional)
Nameserver: 
IP Address:

http://devcenter.heroku.com/articles/custom-domains clearly states the IP Addresses to use so I entered those, but for the nameserver I was unsure. After some googling I thought proxy.heroku.com might work but it does not.

I emailed the registrar after I tried proxy.heroku.com and they said:

You need to enter the IP addresses into the DNS zone file for

HEROKU.COM associated with the name PROXY

We cannot store IP addresses for .COM zones ....

The reason why your name is not working is the Name Server

PROXY.HEROKU.COM

is not correctly configured.

Please contact your DNS provider and ask them to fix it.

Now I'm very confused by the whole thing, perhaps it's the most obvious answer in the world but I just don't get it!

Help very much appreciated!

The registrar is asking you where you want to host your DNS (Not your website). Once you have your DNS setup, you can then point a specific subdomain to heroku.

You first need to setup some DNS hosting. (EasyDNS, Zerigo,... etc)