Answer
The normal force $F_N$ on the crate from the wall is exerted horizontally in the opposite direction that the person pushes on the crate.
Work Step by Step
Because of the horizontal force applied on the crate by the person, the crate exerts a force horizontally on the wall.
By Newton's third law, the wall exerts a normal force on the crate. Note that this force is equal in magnitude and opposite in direction.
The normal force $F_N$ on the crate from the wall is exerted horizontally in the opposite direction that the person pushes on the crate.
