How to change 1&1 name servers

If you use Website Builder:

1. select [ Websites & Applications | Website Builder | Settings ]
2. Assigned domain = [--- none selected ---]
3. click OK

To change DNS name servers:
4. select [Domains | your domain | DNS | Edit DNS settings]
5. Name Server=[My nameserver]
6. Primary nameserver="ns1.drupalvaluehosting.net"
7. Secondary Nameser=[My secondary namesever]
8. Secondary nameserver="ns2.drupalvaluehosting.net"
9. click OK