from memory ....
open the tailgate and remove the lower inner 3/4 liners near the rear lights, 3 torx screws i think
behind each side is one screw that helps secure the bumper
open the two covers on the top surface of the bumpers which reveal two more screws
jack the rear of the vehicle, secure on axle stands and remove the rear road wheels. remove the 4, maybe 5 screws reatining the rear inner wheel arch protectors and remove them
working under the rear unclip the plastic rivets which secure the top of the bumper top a rear crossmember
locate the plastic rivet inside each wheelarch and unclip it
the bumper should then prize away from the vehicle, start in each wheelarch, pull the corner of the bumper down and it should unclip, once both sides are done it should then slide backwards and off.
Be carfeul of the parking sensor wiring.