want to know how to remove rear tail light on 89 chevy celebrity to change light?

I will assume you are talking about the bulb, not the entire housing/ lens. Open your trunk, you will see wires going to a socket in the interior housing. Rotate the socket about 1/4 turn to the left (you will feel it loosen), pull it straight out to check/replace the bulb. To reinstall, reverse the procedure.
 
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