When you have the bottom part of the shroud off, look up at the bottom of the key cylinder, there is a release button (little metal tip). I believe the key has to be forward when you press in on the button and the entire cylinder key and all will come out.
Good Luck.
the black plastic ring pops off....just use a little pressure under it with a flat head screwdriver.
here is the info on your vehicle.
FORD
MODEL YEAR(S)
EXPLORER 1995 -2000
KEY T-HARNESS IMMOBILIZER
FD KEY-1 (1998-2000) FD-1 FORD'S PATS ANTI-THEFT SYSTEM (Some Vehicles), TRANSPONDER, Requires 791 and Extra Ignition Key
PART COLOR LOCATION DIAGRAM
12 VOLT CONSTANT YELLOW (+) IGNITION SWITCH HARNESS
STARTER RED / LIGHT BLUE (+) IGNITION SWITCH HARNESS
STARTER 2 N/A
IGNITION 1 LIGHT GREEN/ PURPLE (+) (1 of 2 wires, use either wire) IGNITION SWITCH HARNESS
IGNITION 2 BLACK/ LIGHT GREEN (+) IGNITION SWITCH HARNESS
IGNITION 3 N/A
ACCESSORY /HEATER BLOWER 1 GRAY / YELLOW (+) (1 of 2 wires, use either wire) IGNITION SWITCH HARNESS
ACCESSORY /HEATER BLOWER 2 N/A
KEYSENSE N/A
PARKING LIGHTS ( - ) WHITE/ PURPLE (-) IN DRIVERS KICK PANEL
PARKING LIGHTS ( + ) WHITE/ BLACK (+) @ HEADLIGHT SWITCH
POWER LOCK PINK / YELLOW (TYPE B) IN DRIVERS KICK PANEL
POWER UNLOCK PINK/LIGHT GREEN (TYPE B) IN DRIVERS KICK PANEL
LOCK MOTOR WIRE N/A
DOOR TRIGGER BLACK/ LIGHT BLUE (+) IN DRIVERS KICK PANEL
DOMELIGHT SUPERVISION USE DOOR TRIGGER
TRUNK RELEASE N/A
SLIDING POWER DOOR N/A
HORN YELLOW/LIGHT GREEN (-) @ STEERING COLUMN HARNESS
TACH TAN / YELLOW @ PCM, See NOTE *1
WAIT TO START LIGHT N/A
BRAKE LIGHT GREEN (+) @ SWITCH ABOVE BRAKE PEDAL
FACTORY ALARM DISARM DARK GREEN/ PURPLE (-) IN DRIVERS KICK PANEL
ANTI-THEFT FORD'S PATS ANTI-THEFT (Some Vehicles) TRANSPONDER SYSTEM TRANSPONDER @ IGNITION SWITCH TUMBLER
NOTES
NOTE *1 The PCM (Powertrain Control Module) is located at the TOP of the FIREWALL towards the PASSENGER SIDE of vehicle
I usually remove the key cylinder before I even start taking off the plastic shroud.Look up from underneath up at the plastic shroud you will see a small hole near the key cylinder area.If you can see up through this hole you will see a small check ball you have to press with the key in the on position.When you press this ball it will release the ignition tumbler from the column.You can then take off the plastic shroud with ease after you have taken out the screws which are also acessed from underneath.