I found these instructions online. hope they help.
(Start these directions after removing glovebox). Compress top and bottom of the whole latch that's on right side door edge, and then swing door open sideways like you're opening a cupboard. The left side of the door has a stationary prong that protrudes through a ring on the filter case. Once the right side of door is unlatched and swung, the door's left side prong can be slid out from the case ring that retains the door face's prong. It is not intuitive when looking at the door for the first time. Owners manual doesn't help.