Draw pretty pictures and have fun. :)
Click once on the canvas to begin drawing. To stop drawing, simply click once again on the canvas.
You can change your color or tool at any time by simply clicking on a new color or tool to the immediate right of the canvas. Once you've made your selection, you can return to the canvas as normal.
You can clear the screen at any time by simply clicking the red X tool to the right of the canvas.
You can also get fairly brief tool descriptions by hovering over them.
Please note that you will be alerted when your image has begun to use up too many resources, and you will be prevented from any further drawing until you clear the canvas.