With the cursor in the scene into which you want to place a non-speaking character, go to Insert > Non-Speaking Character and enter the character's name (note that this name can also be something like "Atmosphere" or "Crowd." This entry will be displayed below the Scene Heading along with the speaking characters.
There is no way to add non-speaking characters to scenes in FD8 and earlier. Information on the upgrade to FD12 is HERE.
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