Practically, a subdomain is a sub folder within the public_http level of your account that has it's own cgi-bin directory. The "timber" example above creates a new top-level folder called timber, with a cgi-bin sub-folder. Upload your files for the subdomain to this location, including a separate home file (such as index.htm).
Currently you cannot create e-mail accounts with the subdomain extension. A workaround for this is to create an account called "
To add a subdomain: