Make sure your TV has an internet connection. Open the Samsung Smart Hub or Samsung App Store, depending on your model, and sign in if necessary. Select recommended apps from the main screen and either browse or search for Plex tv code . Select Install from within the Plex app screen and let the TV install the app. It's required by the server. If you mean a 4-digit security PIN that you set for your account, you control that. You can change/remove it in your Account settings or choose `Automatically sign in` in an app to skip it for that app.