1998 Nissan Altima rear brakes

I need to replace the brake shoes on the rear of my car, however I cant remove the drum, it is knocked free of rust and im told that the shoes will wear into the drum holding it in place. I was also told that there is an adjuster to back the shoes off. I have spent some time trying to locate the adjuster. There doesnt seem to be a wheel with teeth like anyone has described to me that there should be. Can you tell me exactly where the adjuster is and exactly what it looks like?