You need to pop the dash out first - it is one piece and snaps in. Note that your radio is attached and will slide, perhaps with some effort, out of the chassis with the dash. You will have to unhook the headlight switch harness and the 4x4 switch harness (if you have that switch) to swing the dash out of the way.
There are then 4 hex-head screws that hold the instrument cluster in place. Lift it out gently, as you will need to squeeze two release tabs and slide down and out the gearshift indicator from the instrument cluster before you can pull it out more than an inch or two. There will be enough slack in the cluster harness to flip it upside down so you can get to the instrument lights - they are the black circular fittings in the back of the cluster. The come out by a quarter turn counter-clockwise (you may need needlenose pliers). Then pull the bare bulb out of the bulb housing. Most parts houses like NAPA offer a "long life" version of that bulb - well worth the extra buck.