When you go to the stable palette editing page, for the "Edit Palette Code", scroll and select "Default". Then copy the whole block of code text. Then scroll and select "Blank" for the "Edit Palette Code" and paste the code text into the "Edit CSS" block. Then, where ever you see something like #anj9c4, change that combination of letters and numbers to the desired color by using the hex code color selector to find what you'd like. You'll just have to play around with it to figure out which code blocks change which colors on the site :)