Use your mouse to draw (click and drag). Use "E" to edit from a blank slate. Use ARROW keys to change colors (gray-scale). Use "O" to show and hide options (you can't draw while they are shown). Use "L" to browse drawings. Use "S" to save your drawing (PRESS ONLY ONCE). Use "D" to delete an inappropriate drawing that you found.
The cloud data engine I used can be found here: https://scratch.mit.edu/projects/93203050/ You may need to wait a bit for it to load... be patient. Please report any bugs (unless they are 32 bytes :P) I know it isn't 256 bits... shh...