1.Anmelden into Ihr account und on the Domain name in "Meine Produkte"
2.Click on the Domain name you would like to edit
3.Click Domain Services on the left
4.Enter Ihr desired name servers und save
Neinte: Nameserver Update Failed oder Rejected
Wenn you see "Nameserver update rejected" oder "failed" after update Ihr nameservers , the registry may have rejected the nameservers because Ihr nameservers do not meet registry's technical validation requirements. This is usually related to DNS configuration issues, such as the nameservers not being properly configured, not responding coderrectly, oder not set up as authoderitative.
Please contact Ihr DNS/hosting provider to ensure the nameservers are coderrectly set up und publicly resolvable.
Once they are valid, you may try updating them again.