To change the text that is displayed on the button object, highlight the contents of the Text setting and type the new text in. (In this case type in the words Ted Sellers Online.)
Tip: A quick way to select all of the text in a setting is to double-click on the name of the setting in the left-hand column of the properties pane. In this case, that means double-clicking on the word Text itself. Whenever text in a field is highlighted, anything you type will instantly replace the highlighted text.