Domain name delegation is done from your Domain Control Panel here. Go to ACCOUNT MANAGER then select DOMAIN MANAGER and log into your control panel. Your login details would have been sent to you when you first purchased your Domain Name.
On the panel on the left hand side you will see DOMAIN NAMES - select MANAGE DOMAINS then select the domain you wish to manage.
Scroll down to NAME SERVER DETAILS & select UPDATE NAME SERVERS
Delete your parked domains then enter your new domain information - it should look something like this:
Name Server 1: ns1.visualmarketing.com.au 139.99.148.224
Name Server 2: ns2.visualmarketing.com.au 139.99.161.177
Select ADD NAME SERVERS and you're right to go!
It may take up to 24 hours to fully propagate throughout the internet.
Dont forget to lock your domain name as well - this way you will be assured that no one will try to transfer it if you change your email and forget to update your details.
See DOMAIN DETAILS above NAME SERVER DETAILS.