Uploading values for a DFF

Content

As per the client requirement I had to create a DFF ( Descriptive Flex Field) to record extra information of the employee. We use HDL to upload employees to the system. When uploading user information I need to upload data to this DFF also. So how can I add this DFF to the metadata line? 

I have created this DFF under the  Assignment Attributes and it displayed in the " Employment Information" tab when hiring a new employee.