Click the flag to start. Change the size to whatever you want to. Press the "s" key to show the variable and the "h" key to hide it. Press the "e" key to erase. Press the "n" key to make it look a little more 3 dimensional, and press the "n" key again to make it 2 dimensional again. Also, don't mind the tiny dots at the side, I'm not sure how to deal with those.
