That you can do by logging into the control panel and select "DNS" button.
If you don't have any existing e-mail accounts on your domain
Change the name servers
ns1.uniweb.se
ns2.uniweb.se
to the following
ns1.namesystem.se
ns2.namesystem.se
ns3.namesystem.se
but I recommend you to write to UniWeb support and ask how to change your domain name-servers.
/Johnny Gejdner/
Vänliga hälsningar / Best regards