If the following error message appears when trying to view content, you may not be connected to the network: "There was a problem connecting to the iTunes Store to restore the purchase. Please try again later."
First, press the 'menu' button until all of the apps are displayed. Next, navigate to Settings > Network.
Wi-Fi should be the first option at the top of the page and will cause the TV to search for and display all of the networks that are available.
Scroll to and select the network you would like to use. Keep in mind you may be prompted to enter a password.