DNS management is enabled by default under Plesk on Linux. You would need to make sure that the nameserver settings on any domains are pointed to the IP address of the Dynamic Server. If the domain is not hosted by us then you would need to contact your domain providor to have this setup. If your domain is managed by us then you can connect to your control panel and make the changes there or contact support for help.

When a new website is created in Plesk, DNS is automatically created for this domain unless the DNS tick box is unchecked at website creation time.

To manage the DNS entries browse to the domain within your Plesk Control Panel. The words "Web Site" is actually a button that you can press. If you select this button you will see more administration functions including DNS Settings. Select DNS Settings and from this screen you will be able to add, remove and modify DNS settings.