Login to Direct Admin console and click on your target domain .

Click at the Administrator Settings under Extra Features section as show below.

Under section Server Settings, you will see something similar as below.

Change the NS1 and NS2 content into pdns1.serverfreak.biz and pdns2.serverfreak.biz as shown below.

Scroll down the form until bottom, and click Save button.

You will see a notification show as below, which means the setting will be take place in the server within 1 minute time.

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