how to remove rear brake rotor

The screws have right hand threads. To remove the rotor you will have to remove the wheel, the caliper and the two screws holding the rotor. The rotor will pull off after that.

The 2 phillips head screws holding the Rotor on remove counter-clockwise. You will need an impact wrench to remove. I found it easier, and cheaper, to remove these screws with a hammer and a center punch. The 'Shop' wanted $100 just to remove these screws. Just make a dimple with a few strait on hammer hits, then angle the center punch to hammer the screw off counter-clockwise. There is a good chance you will destroy the screws, so go to the dealer and buy replacement screws before you begin the work.