Login to your Control Panel (www.yourdomain.com/cpanel) and click on the Manage SubDomains link in the Domains Settings area.

Note: You can only successfully create a new subdomain once your Domain has been successfully propagated for this account.

Enter the text for the new subdomain in the available field. You must conform to domain name conventions for the addition to the name.

Click on the 'Add' button. Click on the Manage SubDomains link to return to the Subdomains window to confirm that it has been added. A folder with the same name as the subdomain has now been added to your public_html folder, with a cgi-bin sub-folder (if CGI scripts are enabled on your account).