Your DNS settings change depending on the server your account is located on, please contact us via the ticketing system to ask.
For our business hosting accounts we recommend that you point your domain's name server records to us. This will allow our servers to switch to the secondary servers and safeguard your website from downtime. If you don't do this your domain will not follow therefore your website will appear offline until you have manually changed the DNS settings.
Please contact us via the ticketing system if you have any questions regarding this matter.