are you trying to change the bulb because it is burnt out?
The lamp looks like it is attached with two screws
https://www.1aauto.com/license-plat...MIvLzN7LKD2QIVT15-Ch1HFArWEAQYBCABEgLXo_D_BwE
It's done from inside the trunk
http://www.wikituneup.com/wikit/1997_Pontiac_Sunfire_Replace_License_Plate_Light