I assume you ask for FTP remote directory.
You can just leave it blank. Please note DriveHQ offers full-feature virtual FTP server hosting service. It is not like a regular FTP account - you actually get a full virtual server, so you are not restricted in a single user directory.
If you use our group account service, you can create many sub-users, all of them can logon DriveHQ FTP server or the website. You can share folders among your group members. You can share different folders to different users with different levels of access rights. Your sub-users can logon and access the folders shared to them in the special folder: