Our nameservers are:
Also, you can find them, along with other useful details about your hosting package, in the " New Account Information " email sent by us.
The Nameservers are changed at your Registrar account - where you bought the Domain Name from. Search for the DNS/Nameserver zone and edit them.
After that, you need to wait for the DNS Propagation to take place.
Please note that the DNS propagation takes somewhere between 30 minutes and 24 hours. This propagation time depends only on your Internet Sevice Provider, it is not up to us or you.