You can draw with your mouse, set the size of the pixels, and press the "save icon" in the bottom-right-corner. You will get a code, and if the amount of pixels is 19 or higher than 19, the code will be shorter than 500 numbers, and you can paste it in the comments for others to load. Others can then press the "open icon", right next to the "save icon", paste the code in it and the drawing will load. Press the right arrow to change color.
IMPORTANT!!! Sometimes you have to load a drawing 2 times, so paste it, press enter, and once it's loaded, paste it again and press enter again. And you should play in turbo mode (Shift+click the green flag)