First off, the search bar is a magnifying glass on the far right of the navigation bar of the site. It's a bit hard to see, so I see why you asked.
As for the arms being different colors, I think under the "Appearance" tab, there's a spot for skin tone, and you can change it to the skin tone number that accurately represents the heads. You'll have to be pretty knowledgeable about the numbers and what they correspond to, since on the editor, it's just the number and nothing else.
Hope that helps!