To remove the standard focusing screen, pull the screen retainer pin   toward you with the pincette supplied with the interchangeable focusing screen. The focusing screen will then flip down. Remove the screen from the frame by grasping the protruding portion of the screen with the pincette.

To install the screen of your choice, place it on the screen frame, pushing it back to the original position until it locks with a click. To remove dust particles from the screen, never wipe it with a cloth, or the like, but just use a blower. www.4butkus.org