How do I change the cabin filter on my 2002 Honda Accord SE?

There are two filters.
You have the remove the glove box. Three screws on the bottom edge. Remove them, then open the glove box door. Three plastic covers along the top edge, remove with something that won't cut them up. Remove screws under them (two screws under the center one). Then, push the glove box hinges toward each other to disengage the clips in the dashboard. Then pull the glove box assembly down and out (when the box is part way out, disconnect the glove box light connector before you take it the rest of the way).
Once the glove box is out, remove the three screws (two on the right, one on the left) of the glove box reinforcement panel, then remove the panel (the bar looking thing next down from where you took the three screws out of the bottom of the glove box).
Release the snap at the bottom and remove the air conditioning filter lid.
Slide the upper and lower filter assemblies out of the evaporator housing.
Remove the old filters from the filter carriers, clean the carriers and inset the new filters.
Reverse procedure to install.
I know that this sound involved, but just take your time, and you can do it.
Hope this helps you.