Depending on your exhaust, you might have to remove it to obtain access to the rear caliper.

Remove the two caliper mounting bolts (12 mm hex head socket)

Remove the brake pad cover (A black plastic cover)

Remove the Clips from the Pad Pins then remove the Pad Pins

The Brake Pad Spring lifts up (Denote that the spring has an arrow designating the direction of rotation of the rotor upon the top, see location of arrow 3 pictures...