Press Green Flag or space for the spinner. Press R to reset. 1 through 6 will give you different spinners. Up Arrow for bigger. Down Arrow for smaller. Left Arrow to turn left. Right Arrow to turn right. Do not press Right Arrow before pressing Left Arrow. Press S to stop and look at your art. Press b for something new. Press v to change the distortion effect.
if you're on a laptop, don't zoom in. It changes the size of the Spinner.