all you need to know in order to use this is that you should use turbo mode (shift+click on the flag). if scratch had a turbo turbo mode, i'd ask you to use that instead. feel free to remix and chance the formula.
the mandelbrot set is what you get when you iterate a function over every single complex number, and then colour that number in if it doesn't diverge. the function is, with the number being c and z starting off as 0: z=(z^2)+c you get the colours (which aren't in this (yet)) by seeing how many times you have to iterate the function for the number to be farther away from 0 than 2