You more than likely need a set of removal tools. Are there 4 little black holes on the face? If so, this is what you need:
They can be bought at Walmart or similar stores usually, less $5 (maybe $3). Any auto parts store would have them. You stick them in, bend the tools outward so the tips surpress the lock mechanism. Then it just slides out.

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JK007
2003 SCREW, FX4 Lariat
35s on 16s / 3" PA Body Lift / Bilstein shocks /
K&N FIPK / EDGE / Magnaflow True Duals / Other appearance mods