1. Rear Bumper Face

WARNING: This page is about a different car, the 2013 Subaru Forester. However, it is still accessible from the selected car via links, so may be relevant.

Remove the clips inside the wheel housing.

Fig 1: Locating Clips Inside Wheel Housing
Courtesy of SUBARU OF AMERICA, INC.
Remove the bolt.

Fig 2: Locating Rear Bumper Face Bolts
Courtesy of SUBARU OF AMERICA, INC.
Remove the clips on the lower side of rear bumper.

Fig 3: Locating Clips On Lower Side Of Rear Bumper
Courtesy of SUBARU OF AMERICA, INC.
Remove the rear bumper from vehicle body.
1. Detach from the fender side in order from (1) to (3) while pulling up on the bumper face and twisting it towards you. (Both sides)
2. Detach in order from (4) to (6) while pulling up on the center part of the bumper face.
  CAUTION: Do not pull with a excessive force. Otherwise the bracket installation area may be damaged.
  
  Fig 4: Rear Bumper Detaching Order
  Courtesy of SUBARU OF AMERICA, INC.
Remove the reflector.