Where do i find nameservers of my Heroku App?

My Domain Name Manager (Brinkster) required name servers, and did not support CNAME records. So I needed to do the following:

1. Install the Zerigo DNS add-on for my Heroku app.
2. Add the domain name in the Settings tab of my Heroku app.
3. In the Resources tab of my Heroku app. click "Zerigo DNS" under "Add-ons".
4. In the Zerigo management console, click the "Nameservers" tab.
5. Copy the name servers into the form in Brinkster's Domain Manager control panel.

Heroku doesn't provide DNS services therefore there are no name servers.

You use your domain name registrars control panel to point your DNS records at your Heroku application. Typically this is a CNAME record pointing at the .herokuapp.com entry. So www.mydomain.com would be a CNAME to myapp.herokuapp.com.