Instructions
Press the "Release Spirit" button after you have died. The spirit of your character will be split from the corpse and taken to the graveyard closest to the dungeon you died in.
Open your map with the "M" key or by pressing the "World Map" button in the top right corner of the screen. Find the grave marker on the map that displays where your corpse is located.
Travel in ghost form to the instance entrance. This should be located near your corpse but may not be at the exact same location. A message will appear in the center of your screen when you are close telling you to enter the instance to recover your corpse.
Enter the instance. You do not need to find the exact location of your body inside the instance. You will be returned to your body as soon as you enter.