These are a series of template cards that the program provides for you. After you issue the command to Add a Button, you get a dialog screen to specify what the button will look like. So far, we only used the four top choices. However, if you look at the bottom of the screen, you will see Icons as an option. Click on this and you will get numerous picture options that can serve as button images.
Arrows are particularly useful.
The remaining steps for creating the button are the same as usual. When you go to create a button, the bottom four choices are all invisible buttons. In this way you may choose an icon or part of a graphic and make it a button. Invisible buttons can be useful, particularly when the object to click on is intuitive. Place the button on the screen and size it as needed.