How do I remove the plastic housing from the steering column?

Your first problem is that you have a Ford Escort. Hopefully you don't have atilt steering. Nonetheless, as the gentlemen suggested, open up the steering column cover and make a visual inspection. Many of the switch mechanisms are made out of plastic and aftertime they tend to crack. Move the lever to and fro and note as the parts move, noting anything abnormal. You may not need to remove the mechanism. I did a repair similar to your problem using an epoxy. Careful as the same actuator I believe also controls the directional signal. But if you are not too mechanically inclined, I suggest you take it to a dealer.

Good luck.

Hogans Alley