My first pen!! Click the green flag, and hold the mouse down to draw whatever you want. Click the show button, wait a second, and options for your brush and color will pop up. It’s really fun experimenting with the dials to try and get the color you want, using saturation, brightness, and hue to get any color you could think of! Just use white (any color, 0 saturation and 100 brightness) to erase, or click the flag to erase the whole canvas. The transparency is a little strange, but I really don’t know how to fix that. Have fun!