You can edit DNS records from your cpanel.
You can use either "Simple DNS Zone Editor" or "Advanced DNS Zone Editor " available in Cpanel for this purpose.
Please check following links to know more about these great tools.
http://docs.cpanel.net/twiki/bin/view/AllDocumentation/CpanelDocs/SimpleDnsEditor
http://docs.cpanel.net/twiki/bin/view/AllDocumentation/CpanelDocs/AdvancedDnsEditor