Press up arrow for pen size to get bigger, down for it to get smaller. 1-6 changes color in rainbow order, from 1 to 6, not including indigo. 7 is erase/white 8 is black. press space to change to a different shade/color (rainbow order, if you don't want to press the numbers or s. And if you move the pencil while keeping the space button down, you'll get a rainbow.) Press p for pen up and pen down. Press s to change the shade of the color.