How do I replace the air filter in my Whirlpool Wrs325sdhz?

To replace the air filter, remove it from its packaging and snap it into place behind the vented door located along either the rear or left interior wall near the top of the refrigerator compartment. When installing, be sure to activate and install the status indicator as well by placing it facedown on a firm surface and applying pressure until the bubble pops. Verify that the indicator remains visible through the rectangular hole in the air filter door after installation. (Page 12)