I think this needs a tutorial or something - I couldn't work out how to use it or make anything much happen (I don't care greatly for Bootstrap, but I'm always interested in web-based editor type things).
Then click one of the color pickers, and choose a color. Then it should update the demo interface on the left (you may need to scroll to find the right section)
If your using chrome you need to manually enter the values, like #000.
What sort of tutorial do you think, perhaps one of the ones which displays popovers next to each section, and guides you through it ?