Draw with the pencil in the top left corner by clicking and holding down your mouse. If you just want it to follow, just move it. Click on the colours at the bottom for different colours and the ptx buttons on the to for different sizes. If you make a mistake you can rub it out with the eraser, just click the eraser in the bottom right corner and start erasing, again you can change the size of the eraser using the ptx buttons. When you are. Done with that click back on the pen, choose your colour and start drawing again. Finally when you must leave this creation you can clear you drawing either by stopping and starting the program, or clicking the clear button in the top right corner
Thank you to my computer teacher for helping me with the idea and some (most) of the code. Enjoy!