You can edit you Domain DNS in cPanel. 

- Log in to your account, select the service witch is assosiated with the domain you want to update. 
- Log in to your cPanel control Panel (clieck "log in to cPanel" on the menu on the left)
- Click on "Zone Editor".
- Select the domain you want to edit the zone for


All changes will replicate to the slave DNS server at the time you click on "Save Record".