Host sub-domain on DH - dns on ZoneEdit?

Hi - I’ve got a brand new DH account and a domain name ( which has it’s DNS with ZoneEdit.

I want to serve request for from DH. I can create that sub-domain via ZoneEdit but it’s not clear to me how I configure DH so that it will serve requests for it.

In desperation I tried using the “Manage Domains” -> “Add New Domain / Sub-Domain” -> “Fully Hosted” but that generates an error message “Can’t add domain: you don’t have permission to add to” which is fair enough but I don’t want DH to alter my DNS I just want it to set up a virtual directory.

Any ideas ?