1) Select the "Groups" option from the web configuration menu. Create a user group for the Virtual Domain
2) Assign the "administrators" of the Virtual Domain to the newly created Group.
3) Select "Information Bays" from the web configuration menu. Create an IBAY, set the access to WRITE - Group READ - Everyone(*)
4) Select the Admin group from the Group you just created.
5) Set "Public access via Web or anonymous FTP" to Entire Internet (no password required)
6) Set CGI,PHP,SSI executation to "enabled"
7) Select "Virtual Domains" from the Web configuration menu

For Domain Name enter the FULLY QUALIFIED TOP LEVEL DOMAIN NAME. It must have a valid DNS entry somewhere on a real world nameserver, you can't just invent domains.
9) For the content select the IBAY you created.
You're done.

NF