It is recommended using DriveHQ client software (DriveHQ FileManager 4.0) to drag & drop files/folders or automatically synchronize your folders.
If you don't like to install the client software, or if you are using Mac / Linux, you can use DriveHQ FTP, which works with any FTP client software. You can use any third-party FTP client software. For more info, please visit: http://www.drivehq.com/ftp/
Without installing any client software, on Windows, you can use the following address from Windows Explorer (My Computer):
ftp://USERNAME:PASSWORD@ftp.drivehq.com/
You can use the same address on Internet Explorer (not the same as Explorer). On certain operating systems, you cannot drag and drop files if you use Internet Explorer. Use Windows Explorer for drag and drop support.