Right click in the right pane of the content library window to bring up the popup menu with the option Add.
Slide the cursor to the right until you see the second popup menu showing additional options
Select the type of content you wish to add.
The options are:
Media: Select a compatible media file (audio file, image, video, flash swf, zip archive* (HTML, HTML5).
URL: Specify a web page URL (HTML, HTML5).
Template: Opens the Template Designer.
Video Stream: Specify a video stream URL.
Enter the URL and set the duration to the desired length.
Note: The Duration controls when the HTML content will refresh.
Once set a name and click okay the window will disappear and a thumbnail representing the HTML content will show up in the right pane of the Content window.
Add this content to a playlist, in the same way as all other content
Add playlist to your scheduling grid
Send a publish to the player
The screen will now display the configured HTML content