Hi tom pl follow the steps
To resolve or point your domain name to another provider’s DNS server:

1. Log in to Account Manager

2. The Domain Details section (if you have more than one domain name, you will first need to click on the domain name you want to change) displays different options depending on where your domain name is currently pointing:

n If Domain currently points to: Standard Under Construction Page, XX Page Web Site, or A Web Forwarding Address, then to the right of Change domain to point to: select the radio button next to Custom DNS Setting and click on the Apply Change button

n If DNS Settings: is listed then click on Edit DNS

n If Domain currently points to: Designated DNS then click on the Edit link

3. On the Edit DNS page, in the Move DNS to a New Name Server section click on the Continue button

4. After reading the confirmation warning, click on the Continue button to confirm that you understand changing the DNS may cause loss of any services such as Web site, e-mailbox, or Web forwarding

5. In the textboxes type established name servers or select from a list of existing name servers – you can add up to 13 name servers by clicking on the Add More Name Servers button, then when finished click on the Continue button