In your client area, go to Domains → My Domains → Manage Domain → Nameservers. Enter the new nameservers (e.g., ns1.hostblitz.net, ns2.hostblitz.net) and save changes.
In your client area, go to Domains → My Domains → Manage Domain → Nameservers. Enter the new nameservers (e.g., ns1.hostblitz.net, ns2.hostblitz.net) and save changes.