Rear brake drums are held on to a spindle with bearing and a retaining nut. With the vehicle raised and safely supported, remove the tire, then the center grease cap. Remove the cotter pin and the nut lock, then loosen and remove the spindle nut. At this point you just pull the drum towards you, the outer wheel bearing will fall out,(which is okay as long it does not get damaged hitting the ground) if the drum is tight you have to be crafty and try to loosen the brake adjuster with pick tools, you will have to work through the small slot in the backing plate. If the brakes are grinding and metal shavings are visible, you may want to let a shop do it, because if you are not experienced removing the drum is frustrating, especially if you do not have the right tools. Good luck.