Use your mouse to draw. Play with the slider variables! The “Wait” slider sets how many seconds it waits before moving to the mouse if you didn't know. Press S to show and hide the slider variables, making the canvas bigger or smaller. Press F to fill the entire screen with the selected colour. Press L to toggle Lock Mode, it makes the brush stamp once per mouse click, if you don't know what I mean turn lock mode on and start drawing. Press E to erase everything.