You can label a data window in a favorite screen the following way: hit enter for main menus, scroll to "Favorite Screen Setup", enter, scroll to a favorite screen you wish to configure, enter, scroll to title, enter, scroll to custom, enter. You will notice the the text script at the top is blank.  Make your selection of letters and characters below. In order to save your selection you must select "Save & Exit" to complete and assign your text to the Favorite Screen window.