If your web site and /or email is to be hosted with GTP then you will need to change your name server settings to point to GTPs servers

If you have registered your own domain name then change your name servers, please only do this once given the go ahead by GTP.

ns0.gtp.com.au
ns0.atlare.com.au

Here is a video of how to do this is you're registered with Netregistry.