You can also use your own name servers at easyname.
To specify your own nameserver login to your Control Panel and click on [Domains] → [Manage] (pen icon on the right sid of your domain). Below the box with the heading "Accessibility" you will find the link [Use custom nameserver].
Please note that some domain extensions (e.g., .de) require the external nameservers to announce your domain before you make the change at easyname. This means that you must already have set up the domain correctly at your name server provider, before the change can be made.