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Remove the grease dust cap. Pull out the cotter pin. Remove the retaining nut. Inspect the drum. Attempt remove the drum. Retract the brake shoes.
This cap will be in the center of the hub and can be removed by simply prying away from the hub. This will expose the retaining nut. There will be a pin in front of the retaining nut that prevents the nut from loosening (referred to as a cotter pin). Remove it by straightening the bent end of the pin and prying it out of its hole with pliers or a screwdriver. Using a wrench or ratchet, turn the nut counter-clockwise (to the left) to loosen it. If the nut is stuck lubricate it with WD-40 or similar lubricant. Some drums have small bolts holding them to the hub. If this is the case you will need to remove those bolts. Pull the drum straight off of the hub. You may have to wiggle a little to get it started. If the drum appears stuck and will not pull off, you should:  Check to make sure all bolts holding the drum to the hub are removed. Check to see if the drum is getting caught on the brake shoes. This step is only necessary if your drum is getting caught on the brake shoes. You will need to look on the back side of the backing plate (the steel plate on which the brake components are mounted) for a small rubber plug. Removing this plug will provide access to the brake shoe adjuster. Use a flat head screwdriver or a brake adjuster bar to retract the brake shoes.  The adjuster is designed to self-adjust the shoes into a tightened position, so loosening them may be tricky. If the drum gets harder to turn as you adjust, you are going in the wrong direction. Once the drum is removed you can continue.