Nikon D5500 - Manual (Page 53)

29 Introduction
4
Attach a lens.
Be careful to prevent dust from entering the camera when
the lens or body cap is removed.
Be sure to remove the lens cap before taking pictures.
Remove the camera
body cap
Remove the rear
lens cap
Mounting mark (lens)
Mounting mark (camera)
Align the mounting
marks
Rotate the lens as shown until it clicks into place