How to transfer files from my PC to the WD TV Live Hub hard drive via wireless connection?

I have been through the forum, as well as the instructions, and I cannot find out how to actually transfer files from my PC to my WD TV Live Hub hard drive over my network connection.  I can locate my WD TV Live Hub on my computer as a network location, however, I am not sure where to put files within the file structure I have access to. 

Is there an existing root folder that everything goes into, or would I create folders for music, movies, pictures, etc…? 

You can do either.

You can put media in the root folder, or you can create any number of folders (and subfolders) and organize their contents to your liking.