First, you need to download and install the Samsung PC Share Manager, which can be accessed from this link: http://www.samsung.com/us/support/owners/product/UN55C8000XFXZA

Run the PC Share Manager. Then, go to Share → Set Device Priority, find the device called TV-55C8000, and click Accept. After that you should be able to share any folder on your computer. To play your media files, press “source” on the TV remote and navigate to the appropriate DLNA entry.