Nameservers control the DNS records for any domain. By default the name servers for your domain name will be ours and this will allow you and us to control your DNS records.
If you want to change your name servers please contact us.
If you’re not using our name servers we won’t be able help make any changes to your DNS records. As such if you wish to continue using our email or web hosting you’ll need to setup the correct DNS records with whoever owns the new servers.