By default, Plesk  will create one nameserver record. If you want to set up and use your server to handle  DNS  for your domains  then it is recommended  that you use two or more nameserver records. To add another nameserver record you will need  to edit the DNS Template settings in Plesk.

Step (1)-In your Plesk control panel,  click on Tools & Settings within the Server Management section of the left menu  bar.

Step (2)-Under the General Settings section select DNS  Template.

Step (3)-First edit the existing ns1 record by clicking on <domain>  from the Host column.

Step (4)-Enter your first nameserver in the Name server box and click OK.

Step (5)-Next edit the related A record by clicking on ns.<domain>.

Step (6)-Edit the middle field Domain  name to match the prefix value of your nameserver and enter the IP for that nameserver in the IP address box and click OK.

Step (7)-Click the Add DNS record  icon to add in the NS  record for your second  nameserver.

Step (8)-Select NS from the Record type drop down menu, enter the address for your second nameserver in the Name server box and click OK.

Step (9)-Click the Add DNS Record  icon again. This time select A from the Record  type dropdown menu. Enter the prefix of your second nameserver in the Domain name box and the IP for your second nameserver in the IP ddress box, now click OK.

Step (10)-To save your changes  click the link in the orange  banner  at the top of the screen.