You can view the name servers for your hosting plan in the Client Centre. Simply login and choose Settings under the hosting plan in which the website will be hosted and the name servers will be listed there for you.
Note: If you have a VPS with our Hands on Support service, we may have registered name servers for your VPS and the above steps will show them. If you have an unmanaged VPS, name servers are not registered automatically, and so it may be preferable to use registrar level DNS to manage your DNS records.