Nikon D3400 Triple Lens Parent's Kit Owner's Manual

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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.