Press left arrow key to go to drawing slide. Press right arrow key to go to color slide. Click on the white 'E' button to use eraser. Press space to make the pen size thicker. Press 1 to make the pen size thinner. Tap as light as you can when picking your color, cuz a dot will appear if you click normally/hard.
I made this cuz I was bored :P. Credits to @Zinnea for making the tutorial :D