Select Window > Preferences from the main menu. The Atelier > Colors preference page lets you customize the colors used to colorize source code in the Atelier editors. Code elements are grouped by category in the Element field. Select an element and click on the Color indicator to open a dialog box that presents several styles of color picker. Use the style you prefer to select a new color, then dismiss the popup to use the selected color. You can also select text styles such as Bold or Italic. The Preview field shows the result of your selections.