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Locate The Filter
The filter is located behind the glovebox. there are 9 screws and 1 clip that hold it in. The clip is to the right of the glove box on the side. Below is a picture showing the location of the screws.
Screw location image

There are also 2 screws under the dash.
Screw on drivers side image

Screw on passenger side image

Remove Glove Box
Once you have removed the screws and clip you should be able to remove the glove box like the image below.
Glove box remove image

There is a harness that might get in the way, unplug it.
Harness image

==The Filter Cover=
Now the filter cover should be exposed.
Filter cover image

Remove the filter cover so that you can pull out the filter.
Filter cover off image

Remove Dirty Filter
Pull out the dirty filter, it should look like the one below.
Dirty filter image

New Filter
Replace the filter with the a new one.
New filter image

Replace the filter cover
Replace the glove box and screws.
Plug in the harness.
You are done.
References
http://www.iwsti.com/forums/how-install/49232-change-your-cabin-air-filter-how.html