You're not stupid, there's supposed to be buttons at the bottom of the screen that are cut off for some reason. Looks like you're playing on a Mac. I would venture to say that the Mac version may be broken.
However there's something you can try: https://www.renpy.org/doc/html/display_problems.htm
Basically, hold down shift when the game boots, or shift+G in game and try different rendering options. I hope that works for you.