WARNING: This page is about a different car, the 2006 Subaru Outback and 2006 Subaru Legacy. However, it is still accessible from the selected car via links, so may be relevant.
Disconnect the ground cable from battery.
Remove the lens (A) and mounting screws (B).
Fig 1: Identifying Room Light Lens
Fig 2: Identifying Room Light Mounting Screws
Disconnect the harness connector and remove the room light.