Buttons are a great way to add a call to action, link to an external form, resource or website.
To insert a button
Click inside the article where you'd like the button to appear
To the left of the flashing cursor will be a grey '+' button - click this
From the menu that appears, click Button
Type in the button URL and label and press the Insert button
To delete an button
Find the button on the page you wish to delete
Click to select it, and press backspace on your keyboard