Transmission shifter is stuck in neutral. on 2002 Hyundai Santa Fe

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Just replaced alternator and vehicle runs great. But the shifter won't move out of neutral. Vehicle has been sitting for a yr. Thinking probably rusted or dirty linkage. Have no idea how to check that on the vehicle. Mechanic that put on alternatorm said linkage was tight, so could I use WD 40 on it to loosen it up. Don't want to force it.
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OKAY where is the linkage located on the vehicle? I have tried to google a diagram of the linkage area and come up with nothing. thanks
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