Press D/Right Arrow to turn on the PEN Press A/Left Arrow to turn off the PEN Use the Red, Green, Blue, Alpha, Size variables to customize the pen Use your mouse and click hold to draw. (You can't if the PEN = OFF) Press the Clear button to clear your drawing
NOTE: For erasing just set the RGB all to max 255 or press E (White) Credit to @junebeetle for the RGBA block