To play digital signage on your screen, you will need to purchase it first.
If it's a video, get the HD video download, for $14.95. If it's an image, get the standard image or high quality image download, both for $2.99. Get your download directly from your My Stuff by clicking 'download design', select the publishing tab and click 'Digital Signage'. Select 'Play on Smart TV' to play on your Smart TV.
You can also play the video via your Order History. Click download to go to the download page.
Click 'Play on Smart TV' (highlighted above) and you will find a link. Copy the link and load it on your Smart TV's web browser.