Summarize:

SmartShare is a program on your LG Smart TV that allows you to stream media files directly from your computer to your LG TV over your home network. This lets you watch movies or listen to music stored on your computer without having to transfer the files onto a flash drive or burn a DVD. SmartShare works best when both the computer and TV are connected to your network via Ethernet cable. Using SmartShare over Wi-Fi may result in hitches or low-quality playback. You'll need the TV turned on in order to allow it as a trusted item on your computer. In order to stream your computer's media files to your LG Smart TV, you'll need to connect both the TV and the computer to the same home network. Again, for the best streaming performance, both the TV and the computer should be connected to the router via Ethernet. Click the Windows logo in the bottom-left corner of the screen to do so. Before you can use SmartShare, you'll need to enable media streaming for your computer. This will search your computer for the Media Streaming Options menu item that's usually found in Control Panel. It's at the top of the Start menu's results. Doing so opens the Media Streaming Items menu. This option is in the middle of the window. Scroll through the available options until you find your LG TV, then check its box. If the box is already checked, you don't need to click the checkbox. It's at the bottom of the window. Your PC will now be able to stream content to your LG TV as long as it is connected to the same network. It's in the middle (or the lower-right side) of the remote. Scroll right or left until you find the SmartShare icon, which resembles four colored spheres (red, yellow, green, and blue, respectively), then select the icon with the cursor and press OK. It's a tab on the left side of the screen. You should see your PC's name on the "Devices" page; select it there. Once you open your PC's page, you can browse the video, photo, and music files on your PC. Select any such file to open it on your LG TV. The computer from which you're streaming content must be turned on and logged into your account in order for its files to show up here.
Understand what SmartShare is. Turn on your LG Smart TV. Connect the PC and the LG Smart TV to the same home network. Open Start  on your PC. Type in media streaming options. Click Media streaming options. Click Turn on media streaming. Check the box next to your LG TV's name. Click OK. Press the "Home"  button. Select the SmartShare option. Select Devices. Select your computer. Select media to play it.