Pull the old fuse out and put the replacement fuse in.
Under hood fuses are generally located next to the relay they are for.
No Chevy Celebrity ever had a 4.0L engine
Which engine does your car have?
by the gas pedal and brake. should be a lever that says something like, "pull for fuses"
The petcock on a 1989 Chevy Celebrity is at the bottom of the radiator on the drivers side.
How to change the power steering pump depends on which engine your car has.
To change the front blinker bulb on your 1989 Chevy Celebrity simply reach up behind the bumper and unplug the socket from the fixture. Replace the bulb in the socket and plug the socket back into the fixture.
The oxygen sensor on a 1989 Chevy Celebrity is located in the rear exhaust manifold on top about the center.
Check fuses
You can replace the ignition control module and the crankshaft position sensor as required.
Looking in my factory service manual for a 1989 Chevy Celebrity I found no reference to an accessory relay.
The spark plug gap for your 1989 Chevy Celebrity 2.8 V6 is .045".