how do you remove and replace rear bumper on 2003 dodge neon

When you under it, you should be able to see all the bolts holding it in place, you'll probably want to put in on a lift or jack up the rear. Also make sure that the trunk being closed won't screw up any clearances, that could cause some issues if it does. If you're insistent on using a diagram, you can probably find a Haynes or Chilton manual for your car for cheap online or at your local auto store. Honestly, with a little common sense, it should be really easy to take it off. If you decide to go that route, take pictures so you know where everything went for when you put the new one on. It will help refresh your memory for mounts and placement, etc. Hope this helps and good luck!