To reconfigure an existing domain and make it a domain forwarder please follow the below steps.
Go to "Websites & Domains" tab.
Click on the "Hosting Setting".
Click the [Change] link next to the Hosting type field.
1. Under Hosting type, select the Forwarding option.
2. In the Destination address box, type the Internet address to which you want to redirect visitors.
1. Under Forwarding type, select the preferred type of forwarding. With Moved permanently, a user is redirected to the site and the actual site's address is shown in the user's browser, so the user always knows that he or she is redirected to another address. With frame forwarding, a user is redirected to the site without knowing that the site actually resides at another location, therefore, frame forwarding should be preferred.
2. Click OK.