Cadillac 1998 Seville Owner's Manual page 315

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3. Remove the three wing nuts that fasten the taillamp
to the body.
4. Gently remove the taillamp from the body. The
taillamp is on the bottom of the housing and the rear
turn signal lamp is on the upper part of the housing.
5. Press the bulb socket tab and rotate the socket
counterclockwise to remove it. To remove the bulb,
grasp the socket firmly and pull the bulb out.
Once you have replaced the burned-out bulb, reverse the
steps to reassemble the lamp assembly.
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