For how to set up forwarding on our newer cp.blacknighthosting.com plans please see here:
To set up a redirect on a domain on our older cp.blacknight.com control panel:
Select All domains from the subscription box in the top of your control panel >> Hosted Domains tab >> Click on the domain name >> Web >> Change hosting >> Standard or Frame Forwarding >> Next >> In the forwarding URL enter http://forwarding-address-here > Finish
Give the propagation one hour and the site should redirect.
NOTE: Changing the hosting on a domain removes any applications installed on the domain via the application vault.