"Remove your slippers whenever entering a house."
Translation:E wehe i ke kalipa ke komo i ka hale.
In this case, the word ke does not mean the. It is a verb marker, meaning when or whenever.
Just as in english suggestion/instructive sentences, the subject is generally unnessicary when its understood. "Take off your shoes" is as "E wehe I ke kalipa" in terms of the "you" and "'oe" being unused