Battery Connection on 1998 Ford Contour

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Where does the negative lead connect to ground? My contour is running with the minus connection hanging loose. The battery connection is fine. The grounding lug is not attached to the body or the engine. I have a zetec 2.0L, 4 cyl, auto. I would like to reattach the ground but do not know where to make the proper connection.
(1) Answer
It's hard to say without seeing this, but the negative cable will attach to the battery, then to the body and possibly the engine or transmission housing. Is the loose connection broken? Or is the terminal in tact but disconnected?