Introduction - If you have any usage issues, please Google them yourself
Use of "rubber band" drawing a line to draw an arbitrary polygon, and then 4-connected region filling algorithm fills in the full
Draw a line: Use the left mouse button click on the screen a bit, and then drag the mouse to the location you want to click, and so on, and lastly double-click will link up with the first point to form a closed polygon.
Select Seeds Filling: Using the mouse right-click access to seed points, and then proceed to filling
Color: Taking of the system comes with the color palette selected to fill