Click on the paint boxes to paint. If you choose colours from MORE COLOURS then you have to click back once you have done (I recommend if you are choosing from MORE COLOURS then choose your size -width- once you have clicked back! ENJOY!!! ;) :) ._. I recommend having width on 0 when choosing from MORE COLOURS as it leaves a mark!
I followed one of the tutorials by Scratch and made this! (module 1 paint box) Music is by scratch.