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Serial mice (including wheel mice) are connected to either the COM1 or COM2 port, or to a port in a multiport board. They usually require either 9-pin or 25-pin RS-232 connections.
If you have a COM1 or COM2 port, plug the mouse into one of those ports. If you have a non-intelligent multiport card, plug the mouse into the appropriate port on the card.
It is important that you know the name of the port on which the mouse is to be installed. COM1 uses tty1a, and COM2 uses tty2a. Multiports that are connected to COM ports have similar names but use different letters for each port. For example, a four-port multiport board in COM1 would typically have device names tty1a, tty1b, tty1c, and tty1d to correspond with its four ports. Multiport cards provided with special drivers, often called ``smart cards'', have their own device names; check your multiport manual to find them.