Wrap a finger around the bulb housing behind the 4 wd indicator lights and pull straight back, might have to wiggle them a little. They are held in place by 4 bent spring tabs. With a flashlight behind them you should see these.
In your photo, the right light lens looks dark. Is that a toggle switch to the left of the lights?. It makes me wonder if it didn't have the 4 light indicators at some time and a PO removing 2 of them. If so, the right light may be this one.
The 4 light indicator had a toggle switch to turn the lights off for night time driving. To know for sure, check the back of the transfer case for 2 plunger switches.
The light housing is held by 2 pan head screws, remove them before any paint removal. The lenses are some kind of plastic, not glass, and will warp if hit with paint removal chemicals. On the gauge cluster, if it were flooded, the numbers and letters on the glass would have softened and dissolved away.