Press any of the buttons to start drawing. Hold your mouse down to make the size grow, then let go when it's big enough. Press the Space Key when you want to choose a new thing, And press Clear after you press the space key to clear all of it. when you press circle or square, and press your mouse down to make a circle or square.
I learned this from: Coding From Scratch by Rachel Ziter, but I made a few mods.
