Select the color you want to paint with by clicking on one of the colored buttons.
Select the thickness of the lines using the slider below them.
Using the bottom slider, set the canvas rotation speed.
Touch the canvas if you want to draw a circle or arc.
If you want to stop the canvas from rotating, click on the second button from the right in the bottom row.
To resume canvas rotation, click the same button again or move the bottom slider.
To return the canvas orientation to its original position, click on the right button in the bottom row.
Click on the button second from the left in the bottom row to undo the last changes to the drawing.
Click on the left button in the bottom row to delete the picture completely.
Use the five center buttons on the bottom row to change the position of the canvas relative to the rotation axis. This will allow you to draw a circle or arc centered anywhere on the canvas.