Mouse down to draw. Press the Erase All button to erase everything. Press Color Change so you can change the color. You can't do all colors, though. :( Click "See Inside" to see the code of the sprite "drawer." You could see the huge "if then" code and the colors you may use.
BTW, there's a bug, so some weird stuff might happen. I checked the code, but maybe it's just me and it's not a bug. WHOEVER FINDS WHAT'S WRONG FIRST AND TELLS ME IN THE COMMENTS GETS A FOLLOW AND A LIKE AND FAVE ON THEIR LEAST POPULAR PROJECT!