Pe has two separate preferences panels: one for global settings (pull down Window | Preferences) and one for settings that affect only the current document (pull down Window | File Options). In the Colors section of the Preferences panel, single-click any color square to change that background or text color. If you have a copy of RoColor, you can drag colors out of it and onto the color squares, to make the process even easier, or to easily match colors to your desktop color, for example.