1) Mouse down to paint. 2)Click the paintbrush to activate it. 3)You can choose standard colours or use right and left arrow keys to change it to the shade of your choice. 4)Up and down arrow keys to change brightness. 5)Clear button to clear (duh !) 6)Click on the drop-down arrow at the top to show the brush thickness options. 7)Key x to deactivate the paintbrush.
Please don't mind the brush shape. I am not good at art. Everything by me Please love, favourite and follow !